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impl framebuffer blit function

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This commit is contained in:
Bigfoot71 2025-04-23 17:48:04 +02:00
parent fbdd38c92c
commit aff76d9692
1 changed files with 48 additions and 4 deletions
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52
src/external/rlsw.h vendored
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@ -447,6 +447,7 @@ void swClose(void);
bool swResizeFramebuffer(int w, int h);
void swCopyFramebuffer(int x, int y, int w, int h, SWformat format, SWtype type, void* pixels);
void swBlitFramebuffer(int xDst, int yDst, int wDst, int hDst, int xSrc, int ySrc, int wSrc, int hSrc, SWformat format, SWtype type, void* pixels);
void* swGetColorBuffer(int* w, int* h);
void swEnable(SWstate state);
@ -3160,14 +3161,57 @@ void swCopyFramebuffer(int x, int y, int w, int h, SWformat format, SWtype type,
void* src = RLSW.framebuffer.color;
int srcW = RLSW.framebuffer.width;
int srcHm1 = RLSW.framebuffer.height - 1;
int wSrc = RLSW.framebuffer.width;
int hSrcM1 = RLSW.framebuffer.height - 1;
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
float color[4];
sw_framebuffer_read_color(color, sw_framebuffer_get_color_addr(src, (srcHm1 - y) * srcW + x));
sw_set_pixel(pixels, y * srcW + x, pFormat, color);
sw_framebuffer_read_color(color, sw_framebuffer_get_color_addr(src, (hSrcM1 - y) * wSrc + x));
sw_set_pixel(pixels, y * wSrc + x, pFormat, color);
}
}
}
void swBlitFramebuffer(int xDst, int yDst, int wDst, int hDst,
int xSrc, int ySrc, int wSrc, int hSrc,
SWformat format, SWtype type, void* pixels)
{
sw_pixelformat_e pFormat = sw_get_pixel_format(format, type);
void* src = RLSW.framebuffer.color;
int fbWidth = RLSW.framebuffer.width;
int fbHeight = RLSW.framebuffer.height;
// Calculation of scaling factors in 16.16 (fixed-point)
const int xScale = (wSrc << 16) / wDst;
const int yScale = (hSrc << 16) / hDst;
const int xSrcBase = xSrc << 16;
const int ySrcBase = ySrc << 16;
for (int y = 0; y < hDst; y++) {
const int ySrcFixed = ySrcBase + y * yScale;
const int ySrcInt = ySrcFixed >> 16;
if ((unsigned)ySrcInt >= (unsigned)fbHeight) {
continue;
}
for (int x = 0; x < wDst; x++) {
const int xSrcFixed = xSrcBase + x * xScale;
const int xSrcInt = xSrcFixed >> 16;
if ((unsigned)xSrcInt >= (unsigned)fbWidth) {
continue;
}
float color[4];
const int srcIndex = ySrcInt * fbWidth + xSrcInt;
sw_framebuffer_read_color(color, sw_framebuffer_get_color_addr(src, srcIndex));
const int dstIndex = (yDst + y) * wDst + (xDst + x);
sw_set_pixel(pixels, dstIndex, pFormat, color);
}
}
}