review line raster
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Bigfoot71
parent
dd48df432e
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1 changed files with 80 additions and 73 deletions
153
src/external/rlsw.h
vendored
153
src/external/rlsw.h
vendored
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@ -3376,133 +3376,140 @@ static inline void FUNC_NAME(const sw_vertex_t* v0, const sw_vertex_t* v1) \
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int x2 = (int)(v1->screen[0] + 0.5f); \
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int y2 = (int)(v1->screen[1] + 0.5f); \
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\
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float z1 = v0->homogeneous[2]; \
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float z2 = v1->homogeneous[2]; \
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int dx = x2 - x1; \
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int dy = y2 - y1; \
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\
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int shortLen = y2 - y1; \
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int longLen = x2 - x1; \
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bool yLonger = 0; \
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/* Handling of lines that are more horizontal or vertical */ \
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\
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if (abs(shortLen) > abs(longLen)) { \
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int tmp = shortLen; \
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shortLen = longLen; \
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longLen = tmp; \
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yLonger = 1; \
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if (dx == 0 && dy == 0) { \
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/* TODO: A point should be rendered here */ \
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return; \
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} \
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\
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float invEndVal = 1.0f / longLen; \
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int endVal = longLen; \
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int sgnInc = 1; \
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bool yLonger = (abs(dy) > abs(dx)); \
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int longLen, shortLen; \
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\
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if (longLen < 0) { \
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longLen = -longLen; \
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sgnInc = -1; \
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if (yLonger) { \
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longLen = dy; \
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shortLen = dx; \
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} else { \
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longLen = dx; \
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shortLen = dy; \
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} \
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\
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int decInc = (longLen == 0) ? 0 \
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: (shortLen << 16) / longLen; \
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/* Handling of traversal direction */ \
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\
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int sgnInc = (longLen < 0) ? -1 : 1; \
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int abslongLen = abs(longLen); \
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\
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/* Calculation of the increment step for the shorter coordinate */ \
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\
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int decInc = 0; \
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if (abslongLen != 0) { \
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decInc = (shortLen << 16) / abslongLen; \
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} \
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\
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float longLenRcp = (abslongLen != 0) ? (1.0f / abslongLen) : 0.0f; \
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\
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/* Calculation of interpolation steps */ \
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\
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const float zStep = (v1->homogeneous[2] - v0->homogeneous[2]) * longLenRcp; \
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const float rStep = (v1->color[0] - v0->color[0]) * longLenRcp; \
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const float gStep = (v1->color[1] - v0->color[1]) * longLenRcp; \
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const float bStep = (v1->color[2] - v0->color[2]) * longLenRcp; \
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const float aStep = (v1->color[3] - v0->color[3]) * longLenRcp; \
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\
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float z = v0->homogeneous[2]; \
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\
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float color[4] = { \
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v0->color[0], \
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v0->color[1], \
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v0->color[2], \
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v0->color[3] \
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}; \
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\
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const int fbWidth = RLSW.framebuffer.width; \
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const float zDiff = z2 - z1; \
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\
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uint8_t* colorBuffer = RLSW.framebuffer.color; \
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uint16_t* depthBuffer = RLSW.framebuffer.depth; \
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void* cBuffer = RLSW.framebuffer.color; \
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void* dBuffer = RLSW.framebuffer.depth; \
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\
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int j = 0; \
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if (yLonger) { \
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for (int i = 0; i != endVal; i += sgnInc, j += decInc) { \
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float t = (float)i * invEndVal; \
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\
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int x = x1 + (j >> 16); \
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int y = y1 + i; \
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float z = z1 + t * zDiff; \
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int offset = y * fbWidth + x; \
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if (yLonger) \
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{ \
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for (int i = 0; i != longLen; i += sgnInc) \
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{ \
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int offset = (y1 + i) * fbWidth + (x1 + (j >> 16)); \
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\
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void* dptr = sw_framebuffer_get_depth_addr( \
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depthBuffer, offset \
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); \
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void* dptr = sw_framebuffer_get_depth_addr(dBuffer, offset); \
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\
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if (ENABLE_DEPTH_TEST) { \
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float depth = sw_framebuffer_read_depth(dptr); \
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if (z > depth) continue; \
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if (z > depth) goto discardA; \
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} \
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\
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sw_framebuffer_write_depth(dptr, z); \
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\
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void* cptr = sw_framebuffer_get_color_addr( \
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colorBuffer, offset \
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); \
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void* cptr = sw_framebuffer_get_color_addr(cBuffer, offset); \
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\
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if (ENABLE_COLOR_BLEND) \
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{ \
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float dstColor[4]; \
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sw_framebuffer_read_color(dstColor, cptr); \
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\
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float srcColor[4]; \
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srcColor[0] = sw_lerp(v0->color[0], v1->color[0], t); \
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srcColor[1] = sw_lerp(v0->color[1], v1->color[1], t); \
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srcColor[2] = sw_lerp(v0->color[2], v1->color[2], t); \
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srcColor[3] = sw_lerp(v0->color[3], v1->color[3], t); \
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\
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sw_blend_colors(dstColor, srcColor); \
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sw_blend_colors(dstColor, color); \
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sw_framebuffer_write_color(cptr, dstColor); \
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} \
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else \
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{ \
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float color[3]; \
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color[0] = sw_lerp(v0->color[0], v1->color[0], t); \
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color[1] = sw_lerp(v0->color[1], v1->color[1], t); \
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color[2] = sw_lerp(v0->color[2], v1->color[2], t); \
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sw_framebuffer_write_color(cptr, color); \
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} \
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\
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discardA: \
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j += decInc; \
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z += zStep; \
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color[0] += rStep; \
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color[1] += gStep; \
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color[2] += bStep; \
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color[3] += aStep; \
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} \
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} \
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else { \
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for (int i = 0; i != endVal; i += sgnInc, j += decInc) { \
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float t = (float)i * invEndVal; \
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else \
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{ \
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for (int i = 0; i != longLen; i += sgnInc) \
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{ \
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int offset = (y1 + (j >> 16)) * fbWidth + (x1 + i); \
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\
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int x = x1 + i; \
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int y = y1 + (j >> 16); \
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float z = z1 + t * zDiff; \
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int offset = y * fbWidth + x; \
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\
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void* dptr = sw_framebuffer_get_depth_addr( \
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depthBuffer, offset \
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); \
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void* dptr = sw_framebuffer_get_depth_addr(dBuffer, offset); \
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\
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if (ENABLE_DEPTH_TEST) { \
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float depth = sw_framebuffer_read_depth(dptr); \
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if (z > depth) continue; \
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if (z > depth) goto discardB; \
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} \
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\
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sw_framebuffer_write_depth(dptr, z); \
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\
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void* cptr = sw_framebuffer_get_color_addr( \
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colorBuffer, offset \
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); \
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void* cptr = sw_framebuffer_get_color_addr(cBuffer, offset); \
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\
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if (ENABLE_COLOR_BLEND) \
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{ \
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float dstColor[4]; \
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sw_framebuffer_read_color(dstColor, cptr); \
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\
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float srcColor[4]; \
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srcColor[0] = sw_lerp(v0->color[0], v1->color[0], t); \
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srcColor[1] = sw_lerp(v0->color[1], v1->color[1], t); \
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srcColor[2] = sw_lerp(v0->color[2], v1->color[2], t); \
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srcColor[3] = sw_lerp(v0->color[3], v1->color[3], t); \
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\
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sw_blend_colors(dstColor, srcColor); \
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sw_blend_colors(dstColor, color); \
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sw_framebuffer_write_color(cptr, dstColor); \
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} \
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else \
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{ \
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float color[3]; \
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color[0] = sw_lerp(v0->color[0], v1->color[0], t); \
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color[1] = sw_lerp(v0->color[1], v1->color[1], t); \
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color[2] = sw_lerp(v0->color[2], v1->color[2], t); \
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sw_framebuffer_write_color(cptr, color); \
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} \
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\
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discardB: \
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j += decInc; \
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z += zStep; \
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color[0] += rStep; \
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color[1] += gStep; \
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color[2] += bStep; \
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color[3] += aStep; \
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} \
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} \
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}
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