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imgui/backends/imgui_impl_sdlsurface3.cpp
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moonpower 5ae4be2b5f Refactor SDL surface backend for improved quad rendering and performance 
- Introduced a new structure ImGui_ImplSDLSurface3_Quad to represent quads.
- Added functions to detect quads and check for constant colors and linear UVs.
- Enhanced rendering functions to utilize quad detection for faster rendering paths.
- Updated the rendering logic in ImGui_ImplSDLSurface3_RenderDrawData to leverage the new quad rendering capabilities.
- Optimized Makefiles and build scripts to include optimization flags for better performance.
2026-03-13 14:19:04 +01:00

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#include "imgui_impl_sdlsurface3.h"
#include "imgui.h"
#ifndef IMGUI_DISABLE
#include <SDL3/SDL.h>
#include <stdint.h>
#include <algorithm>
#include <cmath>
#include <cstring>
struct ImGui_ImplSDLSurface3_FastFormat32
{
Uint32 Rmask;
Uint32 Gmask;
Uint32 Bmask;
Uint32 Amask;
Uint8 Rshift;
Uint8 Gshift;
Uint8 Bshift;
Uint8 Ashift;
bool HasAlpha;
bool Valid;
ImGui_ImplSDLSurface3_FastFormat32() { memset((void*)this, 0, sizeof(*this)); }
};
struct ImGui_ImplSDLSurface3_SurfaceInfo
{
SDL_Surface* Surface;
Uint8* Pixels;
int Pitch;
int Width;
int Height;
const SDL_PixelFormatDetails* Format;
SDL_Palette* Palette;
ImGui_ImplSDLSurface3_FastFormat32 FastFormat;
bool IsFast;
ImGui_ImplSDLSurface3_SurfaceInfo() { memset((void*)this, 0, sizeof(*this)); }
};
struct ImGui_ImplSDLSurface3_RasterVertex
{
float X;
float Y;
float U;
float V;
float R;
float G;
float B;
float A;
};
struct ImGui_ImplSDLSurface3_Quad
{
const ImGui_ImplSDLSurface3_RasterVertex* TL;
const ImGui_ImplSDLSurface3_RasterVertex* TR;
const ImGui_ImplSDLSurface3_RasterVertex* BR;
const ImGui_ImplSDLSurface3_RasterVertex* BL;
};
struct ImGui_ImplSDLSurface3_Data
{
SDL_Surface* TargetSurface;
SDL_Surface* FontSurface;
ImGui_ImplSDLSurface3_SurfaceInfo TargetInfo;
ImVector<ImGui_ImplSDLSurface3_RasterVertex> VertexCache;
ImGui_ImplSDLSurface3_Data() { memset((void*)this, 0, sizeof(*this)); }
};
static ImGui_ImplSDLSurface3_Data* ImGui_ImplSDLSurface3_GetBackendData()
{
return ImGui::GetCurrentContext() ? (ImGui_ImplSDLSurface3_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
}
static inline float ImGui_ImplSDLSurface3_Edge(float ax, float ay, float bx, float by, float px, float py)
{
return (bx - ax) * (py - ay) - (by - ay) * (px - ax);
}
static inline bool ImGui_ImplSDLSurface3_NearEqual(float a, float b)
{
return fabsf(a - b) <= 0.0001f;
}
static inline int ImGui_ImplSDLSurface3_ClampInt(int v, int lo, int hi)
{
return (v < lo) ? lo : (v > hi ? hi : v);
}
static inline Uint8 ImGui_ImplSDLSurface3_ClampByte(float v)
{
if (v <= 0.0f)
return 0;
if (v >= 255.0f)
return 255;
return (Uint8)(v + 0.5f);
}
static inline Uint8 ImGui_ImplSDLSurface3_Mul255(Uint32 a, Uint32 b)
{
Uint32 t = a * b + 128;
return (Uint8)((t + (t >> 8)) >> 8);
}
static ImGui_ImplSDLSurface3_FastFormat32 ImGui_ImplSDLSurface3_BuildFastFormat(const SDL_PixelFormatDetails* format)
{
ImGui_ImplSDLSurface3_FastFormat32 out;
if (format == nullptr)
return out;
if (format->bits_per_pixel != 32 || format->bytes_per_pixel != 4)
return out;
if (format->Rbits != 8 || format->Gbits != 8 || format->Bbits != 8)
return out;
if (format->Amask != 0 && format->Abits != 8)
return out;
out.Rmask = format->Rmask;
out.Gmask = format->Gmask;
out.Bmask = format->Bmask;
out.Amask = format->Amask;
out.Rshift = format->Rshift;
out.Gshift = format->Gshift;
out.Bshift = format->Bshift;
out.Ashift = format->Ashift;
out.HasAlpha = format->Amask != 0;
out.Valid = true;
return out;
}
static bool ImGui_ImplSDLSurface3_CanUseFastPath(SDL_Surface* surface, const ImGui_ImplSDLSurface3_FastFormat32& format)
{
#ifdef IMGUI_IMPL_SDLSURFACE_DISABLE_FAST_PATH
IM_UNUSED(surface);
IM_UNUSED(format);
return false;
#else
if (surface == nullptr || !format.Valid)
return false;
if ((surface->pitch & 3) != 0)
return false;
if ((((uintptr_t)surface->pixels) & 3) != 0)
return false;
return true;
#endif
}
static void ImGui_ImplSDLSurface3_InitSurfaceInfo(ImGui_ImplSDLSurface3_SurfaceInfo* out, SDL_Surface* surface)
{
out->Surface = surface;
out->Pixels = surface ? (Uint8*)surface->pixels : nullptr;
out->Pitch = surface ? surface->pitch : 0;
out->Width = surface ? surface->w : 0;
out->Height = surface ? surface->h : 0;
out->Format = surface ? SDL_GetPixelFormatDetails(surface->format) : nullptr;
out->Palette = surface ? SDL_GetSurfacePalette(surface) : nullptr;
out->FastFormat = ImGui_ImplSDLSurface3_BuildFastFormat(out->Format);
out->IsFast = ImGui_ImplSDLSurface3_CanUseFastPath(surface, out->FastFormat);
}
static inline Uint32 ImGui_ImplSDLSurface3_ReadPixelRaw(const ImGui_ImplSDLSurface3_SurfaceInfo& surface, int x, int y)
{
const Uint8* p = surface.Pixels + y * surface.Pitch + x * surface.Format->bytes_per_pixel;
switch (surface.Format->bytes_per_pixel)
{
case 1:
return *p;
case 2:
return *(const Uint16*)p;
case 3:
if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
return (Uint32)((p[0] << 16) | (p[1] << 8) | p[2]);
return (Uint32)(p[0] | (p[1] << 8) | (p[2] << 16));
case 4:
return *(const Uint32*)p;
default:
return 0;
}
}
static inline void ImGui_ImplSDLSurface3_WritePixelRaw(const ImGui_ImplSDLSurface3_SurfaceInfo& surface, int x, int y, Uint32 pixel)
{
Uint8* p = surface.Pixels + y * surface.Pitch + x * surface.Format->bytes_per_pixel;
switch (surface.Format->bytes_per_pixel)
{
case 1:
*p = (Uint8)pixel;
return;
case 2:
*(Uint16*)p = (Uint16)pixel;
return;
case 3:
if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
{
p[0] = (Uint8)((pixel >> 16) & 0xFF);
p[1] = (Uint8)((pixel >> 8) & 0xFF);
p[2] = (Uint8)(pixel & 0xFF);
}
else
{
p[0] = (Uint8)(pixel & 0xFF);
p[1] = (Uint8)((pixel >> 8) & 0xFF);
p[2] = (Uint8)((pixel >> 16) & 0xFF);
}
return;
case 4:
*(Uint32*)p = pixel;
return;
default:
return;
}
}
static inline void ImGui_ImplSDLSurface3_UnpackFastRGBA(const ImGui_ImplSDLSurface3_FastFormat32& format, Uint32 pixel, Uint8* r, Uint8* g, Uint8* b, Uint8* a)
{
*r = (Uint8)((pixel & format.Rmask) >> format.Rshift);
*g = (Uint8)((pixel & format.Gmask) >> format.Gshift);
*b = (Uint8)((pixel & format.Bmask) >> format.Bshift);
*a = format.HasAlpha ? (Uint8)((pixel & format.Amask) >> format.Ashift) : 255;
}
static inline Uint32 ImGui_ImplSDLSurface3_PackFastRGBA(const ImGui_ImplSDLSurface3_FastFormat32& format, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
Uint32 pixel = (((Uint32)r << format.Rshift) & format.Rmask)
| (((Uint32)g << format.Gshift) & format.Gmask)
| (((Uint32)b << format.Bshift) & format.Bmask);
if (format.HasAlpha)
pixel |= (((Uint32)a << format.Ashift) & format.Amask);
return pixel;
}
static inline void ImGui_ImplSDLSurface3_ReadPixelRGBA(const ImGui_ImplSDLSurface3_SurfaceInfo& surface, int x, int y, Uint8* r, Uint8* g, Uint8* b, Uint8* a)
{
if (surface.IsFast)
{
const Uint32* src = (const Uint32*)(surface.Pixels + y * surface.Pitch) + x;
ImGui_ImplSDLSurface3_UnpackFastRGBA(surface.FastFormat, *src, r, g, b, a);
return;
}
Uint32 pixel = ImGui_ImplSDLSurface3_ReadPixelRaw(surface, x, y);
SDL_GetRGBA(pixel, surface.Format, surface.Palette, r, g, b, a);
}
static inline Uint8 ImGui_ImplSDLSurface3_ReadPixelAlpha(const ImGui_ImplSDLSurface3_SurfaceInfo& surface, int x, int y)
{
if (surface.IsFast)
{
const Uint32* src = (const Uint32*)(surface.Pixels + y * surface.Pitch) + x;
return surface.FastFormat.HasAlpha ? (Uint8)((*src & surface.FastFormat.Amask) >> surface.FastFormat.Ashift) : 255;
}
Uint8 a = 255;
Uint32 pixel = ImGui_ImplSDLSurface3_ReadPixelRaw(surface, x, y);
SDL_GetRGBA(pixel, surface.Format, surface.Palette, nullptr, nullptr, nullptr, &a);
return a;
}
static inline void ImGui_ImplSDLSurface3_BlendPixelFast(const ImGui_ImplSDLSurface3_SurfaceInfo& target, Uint32* dst, Uint8 sr, Uint8 sg, Uint8 sb, Uint8 sa)
{
if (sa == 0)
return;
if (sa == 255)
{
*dst = ImGui_ImplSDLSurface3_PackFastRGBA(target.FastFormat, sr, sg, sb, 255);
return;
}
Uint8 dr, dg, db, da;
ImGui_ImplSDLSurface3_UnpackFastRGBA(target.FastFormat, *dst, &dr, &dg, &db, &da);
Uint8 inv_a = (Uint8)(255 - sa);
Uint8 out_r = (Uint8)(ImGui_ImplSDLSurface3_Mul255(sr, sa) + ImGui_ImplSDLSurface3_Mul255(dr, inv_a));
Uint8 out_g = (Uint8)(ImGui_ImplSDLSurface3_Mul255(sg, sa) + ImGui_ImplSDLSurface3_Mul255(dg, inv_a));
Uint8 out_b = (Uint8)(ImGui_ImplSDLSurface3_Mul255(sb, sa) + ImGui_ImplSDLSurface3_Mul255(db, inv_a));
Uint8 out_a = (target.Format != nullptr && target.Format->Amask != 0) ? (Uint8)(sa + ImGui_ImplSDLSurface3_Mul255(da, inv_a)) : 255;
*dst = ImGui_ImplSDLSurface3_PackFastRGBA(target.FastFormat, out_r, out_g, out_b, out_a);
}
static inline void ImGui_ImplSDLSurface3_BlendPixelGeneric(const ImGui_ImplSDLSurface3_SurfaceInfo& target, int x, int y, Uint8 sr, Uint8 sg, Uint8 sb, Uint8 sa)
{
if (sa == 0)
return;
if (sa == 255)
{
Uint32 pixel = SDL_MapRGBA(target.Format, target.Palette, sr, sg, sb, 255);
ImGui_ImplSDLSurface3_WritePixelRaw(target, x, y, pixel);
return;
}
Uint8 dr, dg, db, da;
Uint32 dst_pixel = ImGui_ImplSDLSurface3_ReadPixelRaw(target, x, y);
SDL_GetRGBA(dst_pixel, target.Format, target.Palette, &dr, &dg, &db, &da);
Uint8 inv_a = (Uint8)(255 - sa);
Uint8 out_r = (Uint8)(ImGui_ImplSDLSurface3_Mul255(sr, sa) + ImGui_ImplSDLSurface3_Mul255(dr, inv_a));
Uint8 out_g = (Uint8)(ImGui_ImplSDLSurface3_Mul255(sg, sa) + ImGui_ImplSDLSurface3_Mul255(dg, inv_a));
Uint8 out_b = (Uint8)(ImGui_ImplSDLSurface3_Mul255(sb, sa) + ImGui_ImplSDLSurface3_Mul255(db, inv_a));
Uint8 out_a = target.FastFormat.HasAlpha ? (Uint8)(sa + ImGui_ImplSDLSurface3_Mul255(da, inv_a)) : 255;
Uint32 pixel = SDL_MapRGBA(target.Format, target.Palette, out_r, out_g, out_b, out_a);
ImGui_ImplSDLSurface3_WritePixelRaw(target, x, y, pixel);
}
static inline bool ImGui_ImplSDLSurface3_SameColor(const ImGui_ImplSDLSurface3_RasterVertex& a, const ImGui_ImplSDLSurface3_RasterVertex& b)
{
return a.R == b.R && a.G == b.G && a.B == b.B && a.A == b.A;
}
static inline void ImGui_ImplSDLSurface3_SetupRasterVertex(ImGui_ImplSDLSurface3_RasterVertex* out, const ImDrawVert& v, const ImVec2& display_pos, const ImVec2& framebuffer_scale)
{
out->X = (v.pos.x - display_pos.x) * framebuffer_scale.x;
out->Y = (v.pos.y - display_pos.y) * framebuffer_scale.y;
out->U = v.uv.x;
out->V = v.uv.y;
out->R = (float)((v.col >> IM_COL32_R_SHIFT) & 0xFF);
out->G = (float)((v.col >> IM_COL32_G_SHIFT) & 0xFF);
out->B = (float)((v.col >> IM_COL32_B_SHIFT) & 0xFF);
out->A = (float)((v.col >> IM_COL32_A_SHIFT) & 0xFF);
}
static void ImGui_ImplSDLSurface3_BuildVertexCache(ImVector<ImGui_ImplSDLSurface3_RasterVertex>* out, const ImDrawList* draw_list, const ImVec2& display_pos, const ImVec2& framebuffer_scale)
{
out->resize(draw_list->VtxBuffer.Size);
for (int vtx_i = 0; vtx_i < draw_list->VtxBuffer.Size; vtx_i++)
ImGui_ImplSDLSurface3_SetupRasterVertex(&out->Data[vtx_i], draw_list->VtxBuffer[vtx_i], display_pos, framebuffer_scale);
}
static void ImGui_ImplSDLSurface3_RenderTriangleFast(const ImGui_ImplSDLSurface3_SurfaceInfo& target, const ImGui_ImplSDLSurface3_SurfaceInfo* texture, bool texture_is_font, const ImGui_ImplSDLSurface3_RasterVertex& v0, const ImGui_ImplSDLSurface3_RasterVertex& v1, const ImGui_ImplSDLSurface3_RasterVertex& v2, int clip_min_x, int clip_min_y, int clip_max_x, int clip_max_y)
{
IM_UNUSED(texture_is_font);
int min_x = std::max((int)std::floor(std::min(v0.X, std::min(v1.X, v2.X))), clip_min_x);
int min_y = std::max((int)std::floor(std::min(v0.Y, std::min(v1.Y, v2.Y))), clip_min_y);
int max_x = std::min((int)std::ceil(std::max(v0.X, std::max(v1.X, v2.X))) - 1, clip_max_x - 1);
int max_y = std::min((int)std::ceil(std::max(v0.Y, std::max(v1.Y, v2.Y))) - 1, clip_max_y - 1);
if (min_x > max_x || min_y > max_y)
return;
float area = ImGui_ImplSDLSurface3_Edge(v0.X, v0.Y, v1.X, v1.Y, v2.X, v2.Y);
if (area == 0.0f)
return;
float sign = (area < 0.0f) ? -1.0f : 1.0f;
area *= sign;
float e0_dx = (v1.Y - v2.Y) * sign;
float e0_dy = (v2.X - v1.X) * sign;
float e1_dx = (v2.Y - v0.Y) * sign;
float e1_dy = (v0.X - v2.X) * sign;
float e2_dx = (v0.Y - v1.Y) * sign;
float e2_dy = (v1.X - v0.X) * sign;
float inv_area = 1.0f / area;
float dw0_dx = e0_dx * inv_area;
float dw0_dy = e0_dy * inv_area;
float dw1_dx = e1_dx * inv_area;
float dw1_dy = e1_dy * inv_area;
float dw2_dx = e2_dx * inv_area;
float dw2_dy = e2_dy * inv_area;
float dr_dx = dw0_dx * v0.R + dw1_dx * v1.R + dw2_dx * v2.R;
float dg_dx = dw0_dx * v0.G + dw1_dx * v1.G + dw2_dx * v2.G;
float db_dx = dw0_dx * v0.B + dw1_dx * v1.B + dw2_dx * v2.B;
float da_dx = dw0_dx * v0.A + dw1_dx * v1.A + dw2_dx * v2.A;
float du_dx = dw0_dx * v0.U + dw1_dx * v1.U + dw2_dx * v2.U;
float dv_dx = dw0_dx * v0.V + dw1_dx * v1.V + dw2_dx * v2.V;
float dr_dy = dw0_dy * v0.R + dw1_dy * v1.R + dw2_dy * v2.R;
float dg_dy = dw0_dy * v0.G + dw1_dy * v1.G + dw2_dy * v2.G;
float db_dy = dw0_dy * v0.B + dw1_dy * v1.B + dw2_dy * v2.B;
float da_dy = dw0_dy * v0.A + dw1_dy * v1.A + dw2_dy * v2.A;
float du_dy = dw0_dy * v0.U + dw1_dy * v1.U + dw2_dy * v2.U;
float dv_dy = dw0_dy * v0.V + dw1_dy * v1.V + dw2_dy * v2.V;
float start_x = (float)min_x + 0.5f;
float start_y = (float)min_y + 0.5f;
float e0_row = ImGui_ImplSDLSurface3_Edge(v1.X, v1.Y, v2.X, v2.Y, start_x, start_y) * sign;
float e1_row = ImGui_ImplSDLSurface3_Edge(v2.X, v2.Y, v0.X, v0.Y, start_x, start_y) * sign;
float e2_row = ImGui_ImplSDLSurface3_Edge(v0.X, v0.Y, v1.X, v1.Y, start_x, start_y) * sign;
float w0_row = e0_row * inv_area;
float w1_row = e1_row * inv_area;
float w2_row = e2_row * inv_area;
float r_row = w0_row * v0.R + w1_row * v1.R + w2_row * v2.R;
float g_row = w0_row * v0.G + w1_row * v1.G + w2_row * v2.G;
float b_row = w0_row * v0.B + w1_row * v1.B + w2_row * v2.B;
float a_row = w0_row * v0.A + w1_row * v1.A + w2_row * v2.A;
float u_row = w0_row * v0.U + w1_row * v1.U + w2_row * v2.U;
float v_row = w0_row * v0.V + w1_row * v1.V + w2_row * v2.V;
int texture_max_x = texture ? (texture->Width - 1) : 0;
int texture_max_y = texture ? (texture->Height - 1) : 0;
for (int y = min_y; y <= max_y; y++)
{
float e0 = e0_row;
float e1 = e1_row;
float e2 = e2_row;
float r = r_row;
float g = g_row;
float b = b_row;
float a = a_row;
float u = u_row;
float v = v_row;
Uint32* dst = (Uint32*)(target.Pixels + y * target.Pitch) + min_x;
for (int x = min_x; x <= max_x; x++)
{
if (e0 >= 0.0f && e1 >= 0.0f && e2 >= 0.0f)
{
Uint8 out_r = ImGui_ImplSDLSurface3_ClampByte(r);
Uint8 out_g = ImGui_ImplSDLSurface3_ClampByte(g);
Uint8 out_b = ImGui_ImplSDLSurface3_ClampByte(b);
Uint8 out_a = ImGui_ImplSDLSurface3_ClampByte(a);
if (texture != nullptr)
{
int tx = ImGui_ImplSDLSurface3_ClampInt((int)(u * (float)texture_max_x + 0.5f), 0, texture_max_x);
int ty = ImGui_ImplSDLSurface3_ClampInt((int)(v * (float)texture_max_y + 0.5f), 0, texture_max_y);
Uint8 tr, tg, tb, ta;
ImGui_ImplSDLSurface3_ReadPixelRGBA(*texture, tx, ty, &tr, &tg, &tb, &ta);
out_r = ImGui_ImplSDLSurface3_Mul255(out_r, tr);
out_g = ImGui_ImplSDLSurface3_Mul255(out_g, tg);
out_b = ImGui_ImplSDLSurface3_Mul255(out_b, tb);
out_a = ImGui_ImplSDLSurface3_Mul255(out_a, ta);
}
ImGui_ImplSDLSurface3_BlendPixelFast(target, dst, out_r, out_g, out_b, out_a);
}
dst++;
e0 += e0_dx;
e1 += e1_dx;
e2 += e2_dx;
r += dr_dx;
g += dg_dx;
b += db_dx;
a += da_dx;
u += du_dx;
v += dv_dx;
}
e0_row += e0_dy;
e1_row += e1_dy;
e2_row += e2_dy;
r_row += dr_dy;
g_row += dg_dy;
b_row += db_dy;
a_row += da_dy;
u_row += du_dy;
v_row += dv_dy;
}
}
static void ImGui_ImplSDLSurface3_RenderTriangleGeneric(const ImGui_ImplSDLSurface3_SurfaceInfo& target, const ImGui_ImplSDLSurface3_SurfaceInfo* texture, bool texture_is_font, const ImGui_ImplSDLSurface3_RasterVertex& v0, const ImGui_ImplSDLSurface3_RasterVertex& v1, const ImGui_ImplSDLSurface3_RasterVertex& v2, int clip_min_x, int clip_min_y, int clip_max_x, int clip_max_y)
{
IM_UNUSED(texture_is_font);
int min_x = std::max((int)std::floor(std::min(v0.X, std::min(v1.X, v2.X))), clip_min_x);
int min_y = std::max((int)std::floor(std::min(v0.Y, std::min(v1.Y, v2.Y))), clip_min_y);
int max_x = std::min((int)std::ceil(std::max(v0.X, std::max(v1.X, v2.X))) - 1, clip_max_x - 1);
int max_y = std::min((int)std::ceil(std::max(v0.Y, std::max(v1.Y, v2.Y))) - 1, clip_max_y - 1);
if (min_x > max_x || min_y > max_y)
return;
float area = ImGui_ImplSDLSurface3_Edge(v0.X, v0.Y, v1.X, v1.Y, v2.X, v2.Y);
if (area == 0.0f)
return;
float sign = (area < 0.0f) ? -1.0f : 1.0f;
area *= sign;
float e0_dx = (v1.Y - v2.Y) * sign;
float e0_dy = (v2.X - v1.X) * sign;
float e1_dx = (v2.Y - v0.Y) * sign;
float e1_dy = (v0.X - v2.X) * sign;
float e2_dx = (v0.Y - v1.Y) * sign;
float e2_dy = (v1.X - v0.X) * sign;
float inv_area = 1.0f / area;
float dw0_dx = e0_dx * inv_area;
float dw0_dy = e0_dy * inv_area;
float dw1_dx = e1_dx * inv_area;
float dw1_dy = e1_dy * inv_area;
float dw2_dx = e2_dx * inv_area;
float dw2_dy = e2_dy * inv_area;
float dr_dx = dw0_dx * v0.R + dw1_dx * v1.R + dw2_dx * v2.R;
float dg_dx = dw0_dx * v0.G + dw1_dx * v1.G + dw2_dx * v2.G;
float db_dx = dw0_dx * v0.B + dw1_dx * v1.B + dw2_dx * v2.B;
float da_dx = dw0_dx * v0.A + dw1_dx * v1.A + dw2_dx * v2.A;
float du_dx = dw0_dx * v0.U + dw1_dx * v1.U + dw2_dx * v2.U;
float dv_dx = dw0_dx * v0.V + dw1_dx * v1.V + dw2_dx * v2.V;
float dr_dy = dw0_dy * v0.R + dw1_dy * v1.R + dw2_dy * v2.R;
float dg_dy = dw0_dy * v0.G + dw1_dy * v1.G + dw2_dy * v2.G;
float db_dy = dw0_dy * v0.B + dw1_dy * v1.B + dw2_dy * v2.B;
float da_dy = dw0_dy * v0.A + dw1_dy * v1.A + dw2_dy * v2.A;
float du_dy = dw0_dy * v0.U + dw1_dy * v1.U + dw2_dy * v2.U;
float dv_dy = dw0_dy * v0.V + dw1_dy * v1.V + dw2_dy * v2.V;
float start_x = (float)min_x + 0.5f;
float start_y = (float)min_y + 0.5f;
float e0_row = ImGui_ImplSDLSurface3_Edge(v1.X, v1.Y, v2.X, v2.Y, start_x, start_y) * sign;
float e1_row = ImGui_ImplSDLSurface3_Edge(v2.X, v2.Y, v0.X, v0.Y, start_x, start_y) * sign;
float e2_row = ImGui_ImplSDLSurface3_Edge(v0.X, v0.Y, v1.X, v1.Y, start_x, start_y) * sign;
float w0_row = e0_row * inv_area;
float w1_row = e1_row * inv_area;
float w2_row = e2_row * inv_area;
float r_row = w0_row * v0.R + w1_row * v1.R + w2_row * v2.R;
float g_row = w0_row * v0.G + w1_row * v1.G + w2_row * v2.G;
float b_row = w0_row * v0.B + w1_row * v1.B + w2_row * v2.B;
float a_row = w0_row * v0.A + w1_row * v1.A + w2_row * v2.A;
float u_row = w0_row * v0.U + w1_row * v1.U + w2_row * v2.U;
float v_row = w0_row * v0.V + w1_row * v1.V + w2_row * v2.V;
int texture_max_x = texture ? (texture->Width - 1) : 0;
int texture_max_y = texture ? (texture->Height - 1) : 0;
for (int y = min_y; y <= max_y; y++)
{
float e0 = e0_row;
float e1 = e1_row;
float e2 = e2_row;
float r = r_row;
float g = g_row;
float b = b_row;
float a = a_row;
float u = u_row;
float v = v_row;
for (int x = min_x; x <= max_x; x++)
{
if (e0 >= 0.0f && e1 >= 0.0f && e2 >= 0.0f)
{
Uint8 out_r = ImGui_ImplSDLSurface3_ClampByte(r);
Uint8 out_g = ImGui_ImplSDLSurface3_ClampByte(g);
Uint8 out_b = ImGui_ImplSDLSurface3_ClampByte(b);
Uint8 out_a = ImGui_ImplSDLSurface3_ClampByte(a);
if (texture != nullptr)
{
int tx = ImGui_ImplSDLSurface3_ClampInt((int)(u * (float)texture_max_x + 0.5f), 0, texture_max_x);
int ty = ImGui_ImplSDLSurface3_ClampInt((int)(v * (float)texture_max_y + 0.5f), 0, texture_max_y);
Uint8 tr, tg, tb, ta;
ImGui_ImplSDLSurface3_ReadPixelRGBA(*texture, tx, ty, &tr, &tg, &tb, &ta);
out_r = ImGui_ImplSDLSurface3_Mul255(out_r, tr);
out_g = ImGui_ImplSDLSurface3_Mul255(out_g, tg);
out_b = ImGui_ImplSDLSurface3_Mul255(out_b, tb);
out_a = ImGui_ImplSDLSurface3_Mul255(out_a, ta);
}
ImGui_ImplSDLSurface3_BlendPixelGeneric(target, x, y, out_r, out_g, out_b, out_a);
}
e0 += e0_dx;
e1 += e1_dx;
e2 += e2_dx;
r += dr_dx;
g += dg_dx;
b += db_dx;
a += da_dx;
u += du_dx;
v += dv_dx;
}
e0_row += e0_dy;
e1_row += e1_dy;
e2_row += e2_dy;
r_row += dr_dy;
g_row += dg_dy;
b_row += db_dy;
a_row += da_dy;
u_row += du_dy;
v_row += dv_dy;
}
}
static bool ImGui_ImplSDLSurface3_DetectQuad(const ImGui_ImplSDLSurface3_RasterVertex* vertices, const ImDrawIdx* idx_buffer, int vtx_offset, unsigned int elem_offset, ImGui_ImplSDLSurface3_Quad* out)
{
int unique_indices[4];
int unique_count = 0;
for (int i = 0; i < 6; i++)
{
int idx = vtx_offset + idx_buffer[elem_offset + i];
bool found = false;
for (int j = 0; j < unique_count; j++)
if (unique_indices[j] == idx)
found = true;
if (!found)
{
if (unique_count >= 4)
return false;
unique_indices[unique_count++] = idx;
}
}
if (unique_count != 4)
return false;
const ImGui_ImplSDLSurface3_RasterVertex* candidates[4];
for (int i = 0; i < 4; i++)
candidates[i] = &vertices[unique_indices[i]];
float min_x = candidates[0]->X;
float max_x = candidates[0]->X;
float min_y = candidates[0]->Y;
float max_y = candidates[0]->Y;
for (int i = 1; i < 4; i++)
{
min_x = std::min(min_x, candidates[i]->X);
max_x = std::max(max_x, candidates[i]->X);
min_y = std::min(min_y, candidates[i]->Y);
max_y = std::max(max_y, candidates[i]->Y);
}
if (!(max_x > min_x) || !(max_y > min_y))
return false;
out->TL = nullptr;
out->TR = nullptr;
out->BR = nullptr;
out->BL = nullptr;
for (int i = 0; i < 4; i++)
{
const ImGui_ImplSDLSurface3_RasterVertex* v = candidates[i];
if (ImGui_ImplSDLSurface3_NearEqual(v->X, min_x) && ImGui_ImplSDLSurface3_NearEqual(v->Y, min_y))
out->TL = v;
else if (ImGui_ImplSDLSurface3_NearEqual(v->X, max_x) && ImGui_ImplSDLSurface3_NearEqual(v->Y, min_y))
out->TR = v;
else if (ImGui_ImplSDLSurface3_NearEqual(v->X, max_x) && ImGui_ImplSDLSurface3_NearEqual(v->Y, max_y))
out->BR = v;
else if (ImGui_ImplSDLSurface3_NearEqual(v->X, min_x) && ImGui_ImplSDLSurface3_NearEqual(v->Y, max_y))
out->BL = v;
else
return false;
}
return out->TL != nullptr && out->TR != nullptr && out->BR != nullptr && out->BL != nullptr;
}
static bool ImGui_ImplSDLSurface3_QuadHasConstantColor(const ImGui_ImplSDLSurface3_Quad& quad)
{
return ImGui_ImplSDLSurface3_SameColor(*quad.TL, *quad.TR) && ImGui_ImplSDLSurface3_SameColor(*quad.TL, *quad.BR) && ImGui_ImplSDLSurface3_SameColor(*quad.TL, *quad.BL);
}
static bool ImGui_ImplSDLSurface3_QuadHasLinearUV(const ImGui_ImplSDLSurface3_Quad& quad)
{
if (!ImGui_ImplSDLSurface3_NearEqual(quad.TL->Y, quad.TR->Y) || !ImGui_ImplSDLSurface3_NearEqual(quad.BL->Y, quad.BR->Y) || !ImGui_ImplSDLSurface3_NearEqual(quad.TL->X, quad.BL->X) || !ImGui_ImplSDLSurface3_NearEqual(quad.TR->X, quad.BR->X))
return false;
float u = quad.TL->U + (quad.TR->U - quad.TL->U) + (quad.BL->U - quad.TL->U);
float v = quad.TL->V + (quad.TR->V - quad.TL->V) + (quad.BL->V - quad.TL->V);
return ImGui_ImplSDLSurface3_NearEqual(u, quad.BR->U) && ImGui_ImplSDLSurface3_NearEqual(v, quad.BR->V);
}
static bool ImGui_ImplSDLSurface3_QuadGetConstantTexel(const ImGui_ImplSDLSurface3_SurfaceInfo& texture, const ImGui_ImplSDLSurface3_Quad& quad, int* out_x, int* out_y)
{
int max_x = texture.Width - 1;
int max_y = texture.Height - 1;
int tx = ImGui_ImplSDLSurface3_ClampInt((int)(quad.TL->U * (float)max_x + 0.5f), 0, max_x);
int ty = ImGui_ImplSDLSurface3_ClampInt((int)(quad.TL->V * (float)max_y + 0.5f), 0, max_y);
int corner_tx[3] =
{
ImGui_ImplSDLSurface3_ClampInt((int)(quad.TR->U * (float)max_x + 0.5f), 0, max_x),
ImGui_ImplSDLSurface3_ClampInt((int)(quad.BR->U * (float)max_x + 0.5f), 0, max_x),
ImGui_ImplSDLSurface3_ClampInt((int)(quad.BL->U * (float)max_x + 0.5f), 0, max_x)
};
int corner_ty[3] =
{
ImGui_ImplSDLSurface3_ClampInt((int)(quad.TR->V * (float)max_y + 0.5f), 0, max_y),
ImGui_ImplSDLSurface3_ClampInt((int)(quad.BR->V * (float)max_y + 0.5f), 0, max_y),
ImGui_ImplSDLSurface3_ClampInt((int)(quad.BL->V * (float)max_y + 0.5f), 0, max_y)
};
for (int i = 0; i < 3; i++)
if (corner_tx[i] != tx || corner_ty[i] != ty)
return false;
*out_x = tx;
*out_y = ty;
return true;
}
static void ImGui_ImplSDLSurface3_RenderSolidRectFast(const ImGui_ImplSDLSurface3_SurfaceInfo& target, const ImGui_ImplSDLSurface3_Quad& quad, int clip_min_x, int clip_min_y, int clip_max_x, int clip_max_y, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
int min_x = std::max((int)ceilf(quad.TL->X - 0.5f), clip_min_x);
int max_x = std::min((int)floorf(quad.TR->X - 0.5f), clip_max_x - 1);
int min_y = std::max((int)ceilf(quad.TL->Y - 0.5f), clip_min_y);
int max_y = std::min((int)floorf(quad.BL->Y - 0.5f), clip_max_y - 1);
if (min_x > max_x || min_y > max_y)
return;
int count = max_x - min_x + 1;
if (a == 255)
{
Uint32 pixel = ImGui_ImplSDLSurface3_PackFastRGBA(target.FastFormat, r, g, b, 255);
for (int y = min_y; y <= max_y; y++)
{
Uint32* dst = (Uint32*)(target.Pixels + y * target.Pitch) + min_x;
std::fill_n(dst, count, pixel);
}
return;
}
for (int y = min_y; y <= max_y; y++)
{
Uint32* dst = (Uint32*)(target.Pixels + y * target.Pitch) + min_x;
for (int x = 0; x < count; x++)
ImGui_ImplSDLSurface3_BlendPixelFast(target, dst + x, r, g, b, a);
}
}
static void ImGui_ImplSDLSurface3_RenderSolidRectGeneric(const ImGui_ImplSDLSurface3_SurfaceInfo& target, const ImGui_ImplSDLSurface3_Quad& quad, int clip_min_x, int clip_min_y, int clip_max_x, int clip_max_y, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
int min_x = std::max((int)ceilf(quad.TL->X - 0.5f), clip_min_x);
int max_x = std::min((int)floorf(quad.TR->X - 0.5f), clip_max_x - 1);
int min_y = std::max((int)ceilf(quad.TL->Y - 0.5f), clip_min_y);
int max_y = std::min((int)floorf(quad.BL->Y - 0.5f), clip_max_y - 1);
if (min_x > max_x || min_y > max_y)
return;
Uint32 opaque_pixel = 0;
if (a == 255)
opaque_pixel = SDL_MapRGBA(target.Format, target.Palette, r, g, b, 255);
for (int y = min_y; y <= max_y; y++)
{
for (int x = min_x; x <= max_x; x++)
{
if (a == 255)
ImGui_ImplSDLSurface3_WritePixelRaw(target, x, y, opaque_pixel);
else
ImGui_ImplSDLSurface3_BlendPixelGeneric(target, x, y, r, g, b, a);
}
}
}
static void ImGui_ImplSDLSurface3_RenderTexturedRectFast(const ImGui_ImplSDLSurface3_SurfaceInfo& target, const ImGui_ImplSDLSurface3_SurfaceInfo& texture, bool texture_is_font, const ImGui_ImplSDLSurface3_Quad& quad, int clip_min_x, int clip_min_y, int clip_max_x, int clip_max_y)
{
int min_x = std::max((int)ceilf(quad.TL->X - 0.5f), clip_min_x);
int max_x = std::min((int)floorf(quad.TR->X - 0.5f), clip_max_x - 1);
int min_y = std::max((int)ceilf(quad.TL->Y - 0.5f), clip_min_y);
int max_y = std::min((int)floorf(quad.BL->Y - 0.5f), clip_max_y - 1);
if (min_x > max_x || min_y > max_y)
return;
Uint8 color_r = (Uint8)quad.TL->R;
Uint8 color_g = (Uint8)quad.TL->G;
Uint8 color_b = (Uint8)quad.TL->B;
Uint8 color_a = (Uint8)quad.TL->A;
float du_dx = (quad.TR->U - quad.TL->U) / (quad.TR->X - quad.TL->X);
float dv_dx = (quad.TR->V - quad.TL->V) / (quad.TR->X - quad.TL->X);
float du_dy = (quad.BL->U - quad.TL->U) / (quad.BL->Y - quad.TL->Y);
float dv_dy = (quad.BL->V - quad.TL->V) / (quad.BL->Y - quad.TL->Y);
float u_const = quad.TL->U - quad.TL->X * du_dx - quad.TL->Y * du_dy;
float v_const = quad.TL->V - quad.TL->X * dv_dx - quad.TL->Y * dv_dy;
int texture_max_x = texture.Width - 1;
int texture_max_y = texture.Height - 1;
for (int y = min_y; y <= max_y; y++)
{
float py = (float)y + 0.5f;
float px = (float)min_x + 0.5f;
float u = u_const + px * du_dx + py * du_dy;
float v = v_const + px * dv_dx + py * dv_dy;
Uint32* dst = (Uint32*)(target.Pixels + y * target.Pitch) + min_x;
for (int x = min_x; x <= max_x; x++)
{
int tx = ImGui_ImplSDLSurface3_ClampInt((int)(u * (float)texture_max_x + 0.5f), 0, texture_max_x);
int ty = ImGui_ImplSDLSurface3_ClampInt((int)(v * (float)texture_max_y + 0.5f), 0, texture_max_y);
Uint8 out_r = color_r;
Uint8 out_g = color_g;
Uint8 out_b = color_b;
Uint8 out_a = color_a;
if (texture_is_font)
{
out_a = ImGui_ImplSDLSurface3_Mul255(out_a, ImGui_ImplSDLSurface3_ReadPixelAlpha(texture, tx, ty));
ImGui_ImplSDLSurface3_BlendPixelFast(target, dst, out_r, out_g, out_b, out_a);
}
else
{
Uint8 tr, tg, tb, ta;
ImGui_ImplSDLSurface3_ReadPixelRGBA(texture, tx, ty, &tr, &tg, &tb, &ta);
out_r = ImGui_ImplSDLSurface3_Mul255(out_r, tr);
out_g = ImGui_ImplSDLSurface3_Mul255(out_g, tg);
out_b = ImGui_ImplSDLSurface3_Mul255(out_b, tb);
out_a = ImGui_ImplSDLSurface3_Mul255(out_a, ta);
ImGui_ImplSDLSurface3_BlendPixelFast(target, dst, out_r, out_g, out_b, out_a);
}
dst++;
u += du_dx;
v += dv_dx;
}
}
}
static void ImGui_ImplSDLSurface3_RenderTexturedRectGeneric(const ImGui_ImplSDLSurface3_SurfaceInfo& target, const ImGui_ImplSDLSurface3_SurfaceInfo& texture, bool texture_is_font, const ImGui_ImplSDLSurface3_Quad& quad, int clip_min_x, int clip_min_y, int clip_max_x, int clip_max_y)
{
int min_x = std::max((int)ceilf(quad.TL->X - 0.5f), clip_min_x);
int max_x = std::min((int)floorf(quad.TR->X - 0.5f), clip_max_x - 1);
int min_y = std::max((int)ceilf(quad.TL->Y - 0.5f), clip_min_y);
int max_y = std::min((int)floorf(quad.BL->Y - 0.5f), clip_max_y - 1);
if (min_x > max_x || min_y > max_y)
return;
Uint8 color_r = (Uint8)quad.TL->R;
Uint8 color_g = (Uint8)quad.TL->G;
Uint8 color_b = (Uint8)quad.TL->B;
Uint8 color_a = (Uint8)quad.TL->A;
float du_dx = (quad.TR->U - quad.TL->U) / (quad.TR->X - quad.TL->X);
float dv_dx = (quad.TR->V - quad.TL->V) / (quad.TR->X - quad.TL->X);
float du_dy = (quad.BL->U - quad.TL->U) / (quad.BL->Y - quad.TL->Y);
float dv_dy = (quad.BL->V - quad.TL->V) / (quad.BL->Y - quad.TL->Y);
float u_const = quad.TL->U - quad.TL->X * du_dx - quad.TL->Y * du_dy;
float v_const = quad.TL->V - quad.TL->X * dv_dx - quad.TL->Y * dv_dy;
int texture_max_x = texture.Width - 1;
int texture_max_y = texture.Height - 1;
for (int y = min_y; y <= max_y; y++)
{
float py = (float)y + 0.5f;
float px = (float)min_x + 0.5f;
float u = u_const + px * du_dx + py * du_dy;
float v = v_const + px * dv_dx + py * dv_dy;
for (int x = min_x; x <= max_x; x++)
{
int tx = ImGui_ImplSDLSurface3_ClampInt((int)(u * (float)texture_max_x + 0.5f), 0, texture_max_x);
int ty = ImGui_ImplSDLSurface3_ClampInt((int)(v * (float)texture_max_y + 0.5f), 0, texture_max_y);
Uint8 out_r = color_r;
Uint8 out_g = color_g;
Uint8 out_b = color_b;
Uint8 out_a = color_a;
if (texture_is_font)
{
out_a = ImGui_ImplSDLSurface3_Mul255(out_a, ImGui_ImplSDLSurface3_ReadPixelAlpha(texture, tx, ty));
}
else
{
Uint8 tr, tg, tb, ta;
ImGui_ImplSDLSurface3_ReadPixelRGBA(texture, tx, ty, &tr, &tg, &tb, &ta);
out_r = ImGui_ImplSDLSurface3_Mul255(out_r, tr);
out_g = ImGui_ImplSDLSurface3_Mul255(out_g, tg);
out_b = ImGui_ImplSDLSurface3_Mul255(out_b, tb);
out_a = ImGui_ImplSDLSurface3_Mul255(out_a, ta);
}
ImGui_ImplSDLSurface3_BlendPixelGeneric(target, x, y, out_r, out_g, out_b, out_a);
u += du_dx;
v += dv_dx;
}
}
}
static bool ImGui_ImplSDLSurface3_TryRenderQuadFast(const ImGui_ImplSDLSurface3_SurfaceInfo& target, const ImGui_ImplSDLSurface3_SurfaceInfo* texture, bool texture_is_font, const ImGui_ImplSDLSurface3_Quad& quad, int clip_min_x, int clip_min_y, int clip_max_x, int clip_max_y)
{
if (!ImGui_ImplSDLSurface3_QuadHasConstantColor(quad))
return false;
Uint8 r = (Uint8)quad.TL->R;
Uint8 g = (Uint8)quad.TL->G;
Uint8 b = (Uint8)quad.TL->B;
Uint8 a = (Uint8)quad.TL->A;
if (texture == nullptr)
{
ImGui_ImplSDLSurface3_RenderSolidRectFast(target, quad, clip_min_x, clip_min_y, clip_max_x, clip_max_y, r, g, b, a);
return true;
}
int tx = 0;
int ty = 0;
if (ImGui_ImplSDLSurface3_QuadGetConstantTexel(*texture, quad, &tx, &ty))
{
if (texture_is_font)
{
a = ImGui_ImplSDLSurface3_Mul255(a, ImGui_ImplSDLSurface3_ReadPixelAlpha(*texture, tx, ty));
}
else
{
Uint8 tr, tg, tb, ta;
ImGui_ImplSDLSurface3_ReadPixelRGBA(*texture, tx, ty, &tr, &tg, &tb, &ta);
r = ImGui_ImplSDLSurface3_Mul255(r, tr);
g = ImGui_ImplSDLSurface3_Mul255(g, tg);
b = ImGui_ImplSDLSurface3_Mul255(b, tb);
a = ImGui_ImplSDLSurface3_Mul255(a, ta);
}
ImGui_ImplSDLSurface3_RenderSolidRectFast(target, quad, clip_min_x, clip_min_y, clip_max_x, clip_max_y, r, g, b, a);
return true;
}
if (!ImGui_ImplSDLSurface3_QuadHasLinearUV(quad))
return false;
ImGui_ImplSDLSurface3_RenderTexturedRectFast(target, *texture, texture_is_font, quad, clip_min_x, clip_min_y, clip_max_x, clip_max_y);
return true;
}
static bool ImGui_ImplSDLSurface3_TryRenderQuadGeneric(const ImGui_ImplSDLSurface3_SurfaceInfo& target, const ImGui_ImplSDLSurface3_SurfaceInfo* texture, bool texture_is_font, const ImGui_ImplSDLSurface3_Quad& quad, int clip_min_x, int clip_min_y, int clip_max_x, int clip_max_y)
{
if (!ImGui_ImplSDLSurface3_QuadHasConstantColor(quad))
return false;
Uint8 r = (Uint8)quad.TL->R;
Uint8 g = (Uint8)quad.TL->G;
Uint8 b = (Uint8)quad.TL->B;
Uint8 a = (Uint8)quad.TL->A;
if (texture == nullptr)
{
ImGui_ImplSDLSurface3_RenderSolidRectGeneric(target, quad, clip_min_x, clip_min_y, clip_max_x, clip_max_y, r, g, b, a);
return true;
}
int tx = 0;
int ty = 0;
if (ImGui_ImplSDLSurface3_QuadGetConstantTexel(*texture, quad, &tx, &ty))
{
if (texture_is_font)
{
a = ImGui_ImplSDLSurface3_Mul255(a, ImGui_ImplSDLSurface3_ReadPixelAlpha(*texture, tx, ty));
}
else
{
Uint8 tr, tg, tb, ta;
ImGui_ImplSDLSurface3_ReadPixelRGBA(*texture, tx, ty, &tr, &tg, &tb, &ta);
r = ImGui_ImplSDLSurface3_Mul255(r, tr);
g = ImGui_ImplSDLSurface3_Mul255(g, tg);
b = ImGui_ImplSDLSurface3_Mul255(b, tb);
a = ImGui_ImplSDLSurface3_Mul255(a, ta);
}
ImGui_ImplSDLSurface3_RenderSolidRectGeneric(target, quad, clip_min_x, clip_min_y, clip_max_x, clip_max_y, r, g, b, a);
return true;
}
if (!ImGui_ImplSDLSurface3_QuadHasLinearUV(quad))
return false;
ImGui_ImplSDLSurface3_RenderTexturedRectGeneric(target, *texture, texture_is_font, quad, clip_min_x, clip_min_y, clip_max_x, clip_max_y);
return true;
}
SDL_Surface* ImGui_ImplSDLSurface3_CreateFontAtlasSurface()
{
ImGuiIO& io = ImGui::GetIO();
unsigned char* pixels = nullptr;
int width = 0;
int height = 0;
io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
if (pixels == nullptr || width <= 0 || height <= 0)
return nullptr;
SDL_Surface* surface = SDL_CreateSurface(width, height, SDL_PIXELFORMAT_RGBA32);
if (surface == nullptr)
return nullptr;
if (SDL_MUSTLOCK(surface) && !SDL_LockSurface(surface))
{
SDL_DestroySurface(surface);
return nullptr;
}
for (int y = 0; y < height; y++)
memcpy((Uint8*)surface->pixels + y * surface->pitch, pixels + (size_t)y * (size_t)width * 4, (size_t)width * 4);
if (SDL_MUSTLOCK(surface))
SDL_UnlockSurface(surface);
SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_NONE);
return surface;
}
bool ImGui_ImplSDLSurface3_Init(SDL_Surface* surface)
{
if (surface == nullptr)
return false;
ImGuiIO& io = ImGui::GetIO();
IMGUI_CHECKVERSION();
IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
ImGui_ImplSDLSurface3_Data* bd = IM_NEW(ImGui_ImplSDLSurface3_Data)();
io.BackendRendererUserData = (void*)bd;
io.BackendRendererName = "imgui_impl_sdlsurface3";
bd->TargetSurface = surface;
ImGui_ImplSDLSurface3_InitSurfaceInfo(&bd->TargetInfo, surface);
bd->FontSurface = ImGui_ImplSDLSurface3_CreateFontAtlasSurface();
if (bd->FontSurface != nullptr)
io.Fonts->TexID = (ImTextureID)bd->FontSurface;
return true;
}
void ImGui_ImplSDLSurface3_Shutdown()
{
ImGui_ImplSDLSurface3_Data* bd = ImGui_ImplSDLSurface3_GetBackendData();
IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?");
ImGuiIO& io = ImGui::GetIO();
ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
io.Fonts->TexID = nullptr;
io.BackendRendererName = nullptr;
io.BackendRendererUserData = nullptr;
platform_io.ClearRendererHandlers();
if (bd->FontSurface != nullptr)
SDL_DestroySurface(bd->FontSurface);
IM_DELETE(bd);
}
void ImGui_ImplSDLSurface3_NewFrame()
{
ImGui_ImplSDLSurface3_Data* bd = ImGui_ImplSDLSurface3_GetBackendData();
IM_ASSERT(bd != nullptr && "Context or backend not initialized! Did you call ImGui_ImplSDLSurface3_Init()?");
IM_UNUSED(bd);
}
void ImGui_ImplSDLSurface3_RenderDrawData(ImDrawData* draw_data)
{
ImGui_ImplSDLSurface3_Data* bd = ImGui_ImplSDLSurface3_GetBackendData();
if (bd == nullptr || draw_data == nullptr || bd->TargetSurface == nullptr)
return;
if (SDL_MUSTLOCK(bd->TargetSurface) && !SDL_LockSurface(bd->TargetSurface))
return;
ImGui_ImplSDLSurface3_InitSurfaceInfo(&bd->TargetInfo, bd->TargetSurface);
if (bd->TargetInfo.Width <= 0 || bd->TargetInfo.Height <= 0)
{
if (SDL_MUSTLOCK(bd->TargetSurface))
SDL_UnlockSurface(bd->TargetSurface);
return;
}
SDL_Surface* active_texture_surface = nullptr;
ImGui_ImplSDLSurface3_SurfaceInfo active_texture_info;
bool active_texture_valid = false;
bool active_texture_locked = false;
bool active_texture_is_font = false;
const ImVec2 clip_off = draw_data->DisplayPos;
const ImVec2 clip_scale = draw_data->FramebufferScale;
for (int n = 0; n < draw_data->CmdListsCount; n++)
{
const ImDrawList* draw_list = draw_data->CmdLists[n];
const ImDrawIdx* idx_buffer = draw_list->IdxBuffer.Data;
ImGui_ImplSDLSurface3_BuildVertexCache(&bd->VertexCache, draw_list, clip_off, clip_scale);
const ImGui_ImplSDLSurface3_RasterVertex* vertex_cache = bd->VertexCache.Data;
for (int cmd_i = 0; cmd_i < draw_list->CmdBuffer.Size; cmd_i++)
{
const ImDrawCmd* pcmd = &draw_list->CmdBuffer[cmd_i];
if (pcmd->UserCallback != nullptr)
{
if (pcmd->UserCallback != ImDrawCallback_ResetRenderState)
pcmd->UserCallback(draw_list, pcmd);
continue;
}
if (pcmd->ElemCount == 0)
continue;
ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y);
ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y);
if (clip_min.x < 0.0f) clip_min.x = 0.0f;
if (clip_min.y < 0.0f) clip_min.y = 0.0f;
if (clip_max.x > (float)bd->TargetInfo.Width) clip_max.x = (float)bd->TargetInfo.Width;
if (clip_max.y > (float)bd->TargetInfo.Height) clip_max.y = (float)bd->TargetInfo.Height;
if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
continue;
int clip_min_x = (int)clip_min.x;
int clip_min_y = (int)clip_min.y;
int clip_max_x = (int)clip_max.x;
int clip_max_y = (int)clip_max.y;
SDL_Surface* texture_surface = (SDL_Surface*)pcmd->GetTexID();
if (texture_surface != active_texture_surface)
{
if (active_texture_locked && active_texture_surface != nullptr)
SDL_UnlockSurface(active_texture_surface);
active_texture_surface = texture_surface;
active_texture_valid = false;
active_texture_locked = false;
active_texture_is_font = false;
if (texture_surface != nullptr)
{
if (SDL_MUSTLOCK(texture_surface))
{
if (!SDL_LockSurface(texture_surface))
active_texture_surface = texture_surface;
else
active_texture_locked = true;
}
if (!SDL_MUSTLOCK(texture_surface) || active_texture_locked)
{
ImGui_ImplSDLSurface3_InitSurfaceInfo(&active_texture_info, texture_surface);
active_texture_valid = active_texture_info.Width > 0 && active_texture_info.Height > 0;
active_texture_is_font = texture_surface == bd->FontSurface;
}
}
}
const ImGui_ImplSDLSurface3_SurfaceInfo* texture_ptr = active_texture_valid ? &active_texture_info : nullptr;
for (unsigned int idx = 0; idx + 2 < (unsigned int)pcmd->ElemCount;)
{
if (idx + 5 < (unsigned int)pcmd->ElemCount)
{
ImGui_ImplSDLSurface3_Quad quad;
if (ImGui_ImplSDLSurface3_DetectQuad(vertex_cache, idx_buffer, pcmd->VtxOffset, pcmd->IdxOffset + idx, &quad))
{
bool rendered = bd->TargetInfo.IsFast
? ImGui_ImplSDLSurface3_TryRenderQuadFast(bd->TargetInfo, texture_ptr, active_texture_is_font, quad, clip_min_x, clip_min_y, clip_max_x, clip_max_y)
: ImGui_ImplSDLSurface3_TryRenderQuadGeneric(bd->TargetInfo, texture_ptr, active_texture_is_font, quad, clip_min_x, clip_min_y, clip_max_x, clip_max_y);
if (rendered)
{
idx += 6;
continue;
}
}
}
ImDrawIdx idx0 = idx_buffer[pcmd->IdxOffset + idx + 0];
ImDrawIdx idx1 = idx_buffer[pcmd->IdxOffset + idx + 1];
ImDrawIdx idx2 = idx_buffer[pcmd->IdxOffset + idx + 2];
const ImGui_ImplSDLSurface3_RasterVertex& v0 = vertex_cache[pcmd->VtxOffset + idx0];
const ImGui_ImplSDLSurface3_RasterVertex& v1 = vertex_cache[pcmd->VtxOffset + idx1];
const ImGui_ImplSDLSurface3_RasterVertex& v2 = vertex_cache[pcmd->VtxOffset + idx2];
if (bd->TargetInfo.IsFast)
ImGui_ImplSDLSurface3_RenderTriangleFast(bd->TargetInfo, texture_ptr, active_texture_is_font, v0, v1, v2, clip_min_x, clip_min_y, clip_max_x, clip_max_y);
else
ImGui_ImplSDLSurface3_RenderTriangleGeneric(bd->TargetInfo, texture_ptr, active_texture_is_font, v0, v1, v2, clip_min_x, clip_min_y, clip_max_x, clip_max_y);
idx += 3;
}
}
}
if (active_texture_locked && active_texture_surface != nullptr)
SDL_UnlockSurface(active_texture_surface);
if (SDL_MUSTLOCK(bd->TargetSurface))
SDL_UnlockSurface(bd->TargetSurface);
}
#endif
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