--- /dev/null
+typedef union {
+ float f;
+ int i;
+} fi_type;
+static __inline__ int IS_INF_OR_NAN(float x)
+{
+ fi_type tmp;
+ tmp.f = x;
+ return !(int)((unsigned int)((tmp.i & 0x7fffffff) - 0x7f800000) >> 31);
+}
+
+struct gl_texture_image {
+ unsigned int Width;
+ unsigned int Height;
+ unsigned int WidthLog2;
+ void *Data;
+};
+struct gl_texture_object {
+ int BaseLevel;
+ struct gl_texture_image *Image[6][15];
+};
+struct gl_texture_unit {
+ struct gl_texture_object *CurrentTex[9];
+};
+struct gl_texture_attrib {
+ struct gl_texture_unit Unit[(16 + 16)];
+};
+struct gl_renderbuffer {
+ void (*PutRowRGB) ();
+};
+struct gl_framebuffer {
+ struct gl_renderbuffer *_ColorDrawBuffers[8];
+};
+struct gl_context {
+ struct gl_framebuffer *DrawBuffer;
+ struct gl_texture_attrib Texture;
+};
+typedef struct {
+ float attrib[30][4];
+} SWvertex;
+typedef struct sw_span {
+ int x, y;
+ unsigned int end;
+ float attrStepX[30][4];
+ int intTex[2], intTexStep[2];
+} SWspan;
+static void simple_textured_triangle(const SWvertex * v1)
+{
+ struct gl_context *ctx;
+ const SWvertex * v0;
+ const SWvertex * v2;
+ typedef struct {
+ float dx;
+ float dy;
+ int fsx;
+ int fx0;
+ int lines;
+ } EdgeT;
+ EdgeT eMaj;
+ EdgeT eTop;
+ EdgeT eBot;
+ float oneOverArea;
+ const SWvertex *vMin;
+ const SWvertex *vMid;
+ const SWvertex *vMax;
+ const int snapMask = ~127;
+ int vMin_fx;
+ int vMin_fy;
+ int vMid_fx;
+ int vMid_fy;
+ int vMax_fx;
+ int vMax_fy;
+ SWspan span;
+ const int fy0 =
+ (((int)
+ ((((v0->attrib[0][1] -
+ 0.5F) * (float)2048) >=
+ 0.0F) ? (((v0->attrib[0][1] - 0.5F) *
+ (float)2048) +
+ 0.5F) : (((v0->attrib[0][1] - 0.5F) *
+ (float)2048) - 0.5F)))) & snapMask;
+ const int fy1 =
+ (((int)
+ ((((v1->attrib[0][1] -
+ 0.5F) * (float)2048) >=
+ 0.0F) ? (((v1->attrib[0][1] - 0.5F) *
+ (float)2048) +
+ 0.5F) : (((v1->attrib[0][1] - 0.5F) *
+ (float)2048) - 0.5F)))) & snapMask;
+ const int fy2 =
+ (((int)
+ ((((v2->attrib[0][1] -
+ 0.5F) * (float)2048) >=
+ 0.0F) ? (((v2->attrib[0][1] - 0.5F) *
+ (float)2048) +
+ 0.5F) : (((v2->attrib[0][1] - 0.5F) *
+ (float)2048) - 0.5F)))) & snapMask;
+ if (fy0 <= fy1) {
+ if (fy1 <= fy2) {
+ vMin = v0;
+ vMax = v1;
+ vMin_fy = fy0;
+ }
+ }
+ vMin_fx =
+ (((int)
+ ((((vMin->attrib[0][0] +
+ 0.5F) * (float)2048) >=
+ 0.0F) ? (((vMin->attrib[0][0] + 0.5F) *
+ (float)2048) +
+ 0.5F) : (((vMin->attrib[0][0] + 0.5F) *
+ (float)2048) - 0.5F)))) & snapMask;
+ vMid_fx =
+ (((int)
+ ((((vMid->attrib[0][0] +
+ 0.5F) * (float)2048) >=
+ 0.0F) ? (((vMid->attrib[0][0] + 0.5F) *
+ (float)2048) +
+ 0.5F) : (((vMid->attrib[0][0] + 0.5F) *
+ (float)2048) - 0.5F)))) & snapMask;
+ eMaj.dx = ((vMax_fx - vMin_fx) * (1.0F / (float)2048));
+ eMaj.dy = ((vMax_fy - vMin_fy) * (1.0F / (float)2048));
+ eTop.dx = ((vMax_fx - vMid_fx) * (1.0F / (float)2048));
+ eBot.dy = ((vMid_fy - vMin_fy) * (1.0F / (float)2048));
+ const float area = eMaj.dx * eBot.dy - eBot.dx * eMaj.dy;
+ if (IS_INF_OR_NAN(area))
+ return;
+ oneOverArea = 1.0F / area;
+ eBot.fx0 = vMin_fx;
+ int scan_from_left_to_right;
+ struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
+ const struct gl_texture_object *obj;
+ const struct gl_texture_image *texImg;
+ const float twidth;
+ const int twidth_log2;
+ const unsigned char *texture = texImg->Data;
+ const int smask = texImg->Width;
+ const int tmask = texImg->Height;
+ float eMaj_ds =
+ (vMax->attrib[4][0] -
+ vMin->attrib[4][0]) * twidth;
+ float eBot_ds;
+ span.attrStepX[4][0] =
+ oneOverArea * (eMaj_ds * eBot.dy - eMaj.dy * eBot_ds);
+ span.intTexStep[0] =
+ (((int)
+ ((((span.attrStepX[4][0]) * (float)2048) >=
+ 0.0F) ? (((span.attrStepX[4][0]) *
+ (float)2048) +
+ 0.5F) : (((span.attrStepX[4][0]) *
+ (float)2048) - 0.5F))));
+ int subTriangle;
+ int fxLeftEdge = 0;
+ int fxRightEdge = 0;
+ int sLeft = 0;
+ for (subTriangle = 0; subTriangle <= 1; subTriangle++) {
+ EdgeT *eRight;
+ int lines;
+ if (subTriangle == 0) {
+ if (scan_from_left_to_right) {
+ eRight = &eBot;
+ lines = eRight->lines;
+ }
+else {
+ eRight = &eMaj;
+ }
+ } else {
+ if (scan_from_left_to_right)
+{
+ eRight = &eTop;
+ }
+ fxRightEdge = eRight->fsx - 1;
+ }
+ while (lines > 0)
+{
+ const int right = fxRightEdge >> 11;
+ span.x = fxLeftEdge >> 11;
+ if (right <= span.x)
+ span.end = 0;
+ else
+ span.end = right - span.x;
+ span.intTex[0] = sLeft;
+ if (span.end > 0 && span.y >= 0)
+{
+ unsigned int i;
+ unsigned char rgb[16384][3];
+ for (i = 0; i < span.end; i++)
+{
+ int s = ((span.intTex[0]) >> 11) & smask;
+ int t =
+ ((span.intTex[1]) >> 11) & tmask;
+ int pos = (t << twidth_log2) + s;
+ rgb[i][0] = texture[pos + 2];
+ span.intTex[0] += span.intTexStep[0];
+ }
+ rb->PutRowRGB(
+rgb
+);
+ }
+ }
+ }
+}
+
+void *foo()
+{
+ return simple_textured_triangle;
+}