--- /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);
+}
+
+typedef enum {
+ FRAG_ATTRIB_WPOS = 0, FRAG_ATTRIB_COL0 = 1, FRAG_ATTRIB_COL1 =
+ 2, FRAG_ATTRIB_FOGC = 3, FRAG_ATTRIB_TEX0 = 4, FRAG_ATTRIB_TEX1 =
+ 5, FRAG_ATTRIB_TEX2 = 6, FRAG_ATTRIB_TEX3 = 7, FRAG_ATTRIB_TEX4 =
+ 8, FRAG_ATTRIB_TEX5 = 9, FRAG_ATTRIB_TEX6 = 10, FRAG_ATTRIB_TEX7 =
+ 11, FRAG_ATTRIB_FACE = 12, FRAG_ATTRIB_PNTC = 13, FRAG_ATTRIB_VAR0 =
+ 14, FRAG_ATTRIB_MAX = (FRAG_ATTRIB_VAR0 + 16)
+} gl_frag_result;
+typedef enum {
+ TEXTURE_BUFFER_INDEX, TEXTURE_2D_ARRAY_INDEX, TEXTURE_1D_ARRAY_INDEX,
+ TEXTURE_CUBE_INDEX, TEXTURE_3D_INDEX, TEXTURE_RECT_INDEX,
+ TEXTURE_2D_INDEX, TEXTURE_1D_INDEX, NUM_TEXTURE_TARGETS
+} gl_texture_index;
+struct gl_texture_image {
+ unsigned int Width;
+ unsigned int Height;
+ unsigned int WidthLog2;
+ void *Data;
+};
+typedef enum {
+ MAX_FACES = 6
+} gl_face_index;
+struct gl_texture_object {
+ int BaseLevel;
+ struct gl_texture_image *Image[MAX_FACES][15];
+};
+struct gl_texture_unit {
+ struct gl_texture_object *CurrentTex[NUM_TEXTURE_TARGETS];
+};
+struct gl_texture_attrib {
+ struct gl_texture_unit Unit[(16 + 16)];
+};
+struct gl_renderbuffer {
+ void (*PutRowRGB) (struct gl_context * ctx, struct gl_renderbuffer * rb,
+ unsigned int count, int x, int y,
+ const void *values);
+};
+struct gl_framebuffer {
+ struct gl_renderbuffer *_ColorDrawBuffers[8];
+};
+struct gl_context {
+ struct gl_framebuffer *DrawBuffer;
+ struct gl_texture_attrib Texture;
+};
+typedef struct {
+ float attrib[FRAG_ATTRIB_MAX][4];
+} SWvertex;
+typedef struct sw_span {
+ int x, y;
+ unsigned int end;
+ float attrStepX[FRAG_ATTRIB_MAX][4];
+ int intTex[2], intTexStep[2];
+} SWspan;
+typedef void (*swrast_tri_func) (struct gl_context * ctx, const SWvertex *,
+ const SWvertex *, const SWvertex *);
+typedef struct {
+ swrast_tri_func Triangle;
+} SWcontext;
+static void simple_textured_triangle(struct gl_context *ctx,
+ const SWvertex * v0, const SWvertex * v1,
+ 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 = ~(((1 << 11) / (1 << 4)) - 1);
+ 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[FRAG_ATTRIB_WPOS][1] -
+ 0.5F) * ((float)(1 << 11))) >=
+ 0.0F) ? (((v0->attrib[FRAG_ATTRIB_WPOS][1] - 0.5F) *
+ ((float)(1 << 11))) +
+ 0.5F) : (((v0->attrib[FRAG_ATTRIB_WPOS][1] - 0.5F) *
+ ((float)(1 << 11))) - 0.5F)))) & snapMask;
+ const int fy1 =
+ (((int)
+ ((((v1->attrib[FRAG_ATTRIB_WPOS][1] -
+ 0.5F) * ((float)(1 << 11))) >=
+ 0.0F) ? (((v1->attrib[FRAG_ATTRIB_WPOS][1] - 0.5F) *
+ ((float)(1 << 11))) +
+ 0.5F) : (((v1->attrib[FRAG_ATTRIB_WPOS][1] - 0.5F) *
+ ((float)(1 << 11))) - 0.5F)))) & snapMask;
+ const int fy2 =
+ (((int)
+ ((((v2->attrib[FRAG_ATTRIB_WPOS][1] -
+ 0.5F) * ((float)(1 << 11))) >=
+ 0.0F) ? (((v2->attrib[FRAG_ATTRIB_WPOS][1] - 0.5F) *
+ ((float)(1 << 11))) +
+ 0.5F) : (((v2->attrib[FRAG_ATTRIB_WPOS][1] - 0.5F) *
+ ((float)(1 << 11))) - 0.5F)))) & snapMask;
+ if (fy0 <= fy1) {
+ if (fy1 <= fy2) {
+ vMin = v0;
+ vMax = v1;
+ vMin_fy = fy0;
+ }
+ }
+ vMin_fx =
+ (((int)
+ ((((vMin->attrib[FRAG_ATTRIB_WPOS][0] +
+ 0.5F) * ((float)(1 << 11))) >=
+ 0.0F) ? (((vMin->attrib[FRAG_ATTRIB_WPOS][0] + 0.5F) *
+ ((float)(1 << 11))) +
+ 0.5F) : (((vMin->attrib[FRAG_ATTRIB_WPOS][0] + 0.5F) *
+ ((float)(1 << 11))) - 0.5F)))) & snapMask;
+ vMid_fx =
+ (((int)
+ ((((vMid->attrib[FRAG_ATTRIB_WPOS][0] +
+ 0.5F) * ((float)(1 << 11))) >=
+ 0.0F) ? (((vMid->attrib[FRAG_ATTRIB_WPOS][0] + 0.5F) *
+ ((float)(1 << 11))) +
+ 0.5F) : (((vMid->attrib[FRAG_ATTRIB_WPOS][0] + 0.5F) *
+ ((float)(1 << 11))) - 0.5F)))) & snapMask;
+ eMaj.dx = ((vMax_fx - vMin_fx) * (1.0F / ((float)(1 << 11))));
+ eMaj.dy = ((vMax_fy - vMin_fy) * (1.0F / ((float)(1 << 11))));
+ eTop.dx = ((vMax_fx - vMid_fx) * (1.0F / ((float)(1 << 11))));
+ eBot.dy = ((vMid_fy - vMin_fy) * (1.0F / ((float)(1 << 11))));
+ const float area = eMaj.dx * eBot.dy - eBot.dx * eMaj.dy;
+ if (IS_INF_OR_NAN(area) || area == 0.0F)
+ return;
+ oneOverArea = 1.0F / area;
+ if (eBot.lines > 0) {
+ eBot.fx0 = vMin_fx;
+ }
+ int scan_from_left_to_right;
+ struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
+ const struct gl_texture_object *obj =
+ ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX];
+ const struct gl_texture_image *texImg = obj->Image[0][obj->BaseLevel];
+ const float twidth = (float)texImg->Width;
+ const int twidth_log2 = texImg->WidthLog2;
+ const unsigned char *texture = (const unsigned char *)texImg->Data;
+ const int smask = texImg->Width - 1;
+ const int tmask = texImg->Height - 1;
+ if (!rb || !texture) {
+ return;
+ }
+ float eMaj_ds =
+ (vMax->attrib[FRAG_ATTRIB_TEX0][0] -
+ vMin->attrib[FRAG_ATTRIB_TEX0][0]) * twidth;
+ float eBot_ds =
+ (vMid->attrib[FRAG_ATTRIB_TEX0][0] -
+ vMin->attrib[FRAG_ATTRIB_TEX0][0]) * twidth;
+ span.attrStepX[FRAG_ATTRIB_TEX0][0] =
+ oneOverArea * (eMaj_ds * eBot.dy - eMaj.dy * eBot_ds);
+ span.intTexStep[0] =
+ (((int)
+ ((((span.attrStepX[FRAG_ATTRIB_TEX0][0]) * ((float)(1 << 11))) >=
+ 0.0F) ? (((span.attrStepX[FRAG_ATTRIB_TEX0][0]) *
+ ((float)(1 << 11))) +
+ 0.5F) : (((span.attrStepX[FRAG_ATTRIB_TEX0][0]) *
+ ((float)(1 << 11))) - 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(ctx, rb, span.end, span.x, span.y,
+ rgb);
+ }
+ }
+ }
+}
+
+void _swrast_choose_triangle(struct gl_context *ctx)
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ swrast->Triangle = simple_textured_triangle;
+}
git.wh0rd.org / ICEs.git / blobdiff