-/* $Id: s_triangle.c,v 1.34 2001/07/14 17:53:04 brianp Exp $ */
+/* $Id: s_triangle.c,v 1.35 2001/07/23 16:47:53 brianp Exp $ */
/*
* Mesa 3-D graphics library
affine_span(GLcontext *ctx, struct triangle_span *span,
struct affine_info *info)
{
- GLint tr, tg, tb, ta;
+ GLchan tmp_col[4];
/* Instead of defining a function for each mode, a test is done
* between the outer and inner loops. This is to reduce code size
* unused variables (for instance tf,sf,ti,si in case of GL_NEAREST).
*/
-#define NEAREST_RGB \
- tr = tex00[RCOMP]; \
- tg = tex00[GCOMP]; \
- tb = tex00[BCOMP]; \
- ta = CHAN_MAX
+#define NEAREST_RGB \
+ tmp_col[RCOMP] = tex00[RCOMP]; \
+ tmp_col[GCOMP] = tex00[GCOMP]; \
+ tmp_col[BCOMP] = tex00[BCOMP]; \
+ tmp_col[ACOMP] = CHAN_MAX
#define LINEAR_RGB \
- tr = (ti * (si * tex00[0] + sf * tex01[0]) + \
- tf * (si * tex10[0] + sf * tex11[0])) >> 2 * FIXED_SHIFT; \
- tg = (ti * (si * tex00[1] + sf * tex01[1]) + \
- tf * (si * tex10[1] + sf * tex11[1])) >> 2 * FIXED_SHIFT; \
- tb = (ti * (si * tex00[2] + sf * tex01[2]) + \
- tf * (si * tex10[2] + sf * tex11[2])) >> 2 * FIXED_SHIFT; \
- ta = CHAN_MAX
-
-#define NEAREST_RGBA \
- tr = tex00[RCOMP]; \
- tg = tex00[GCOMP]; \
- tb = tex00[BCOMP]; \
- ta = tex00[ACOMP]
+ tmp_col[RCOMP] = (ti * (si * tex00[0] + sf * tex01[0]) + \
+ tf * (si * tex10[0] + sf * tex11[0])) >> 2 * FIXED_SHIFT; \
+ tmp_col[GCOMP] = (ti * (si * tex00[1] + sf * tex01[1]) + \
+ tf * (si * tex10[1] + sf * tex11[1])) >> 2 * FIXED_SHIFT; \
+ tmp_col[BCOMP] = (ti * (si * tex00[2] + sf * tex01[2]) + \
+ tf * (si * tex10[2] + sf * tex11[2])) >> 2 * FIXED_SHIFT; \
+ tmp_col[ACOMP] = CHAN_MAX
+
+#define NEAREST_RGBA COPY_CHAN4(tmp_col, tex00)
#define LINEAR_RGBA \
- tr = (ti * (si * tex00[0] + sf * tex01[0]) + \
- tf * (si * tex10[0] + sf * tex11[0])) >> 2 * FIXED_SHIFT; \
- tg = (ti * (si * tex00[1] + sf * tex01[1]) + \
- tf * (si * tex10[1] + sf * tex11[1])) >> 2 * FIXED_SHIFT; \
- tb = (ti * (si * tex00[2] + sf * tex01[2]) + \
- tf * (si * tex10[2] + sf * tex11[2])) >> 2 * FIXED_SHIFT; \
- ta = (ti * (si * tex00[3] + sf * tex01[3]) + \
- tf * (si * tex10[3] + sf * tex11[3])) >> 2 * FIXED_SHIFT
-
-#define MODULATE \
- dest[RCOMP] = span->red * (tr + 1) >> (FIXED_SHIFT + 8); \
- dest[GCOMP] = span->green * (tg + 1) >> (FIXED_SHIFT + 8); \
- dest[BCOMP] = span->blue * (tb + 1) >> (FIXED_SHIFT + 8); \
- dest[ACOMP] = span->alpha * (ta + 1) >> (FIXED_SHIFT + 8)
+ tmp_col[RCOMP] = (ti * (si * tex00[0] + sf * tex01[0]) + \
+ tf * (si * tex10[0] + sf * tex11[0])) >> 2 * FIXED_SHIFT;\
+ tmp_col[GCOMP] = (ti * (si * tex00[1] + sf * tex01[1]) + \
+ tf * (si * tex10[1] + sf * tex11[1])) >> 2 * FIXED_SHIFT;\
+ tmp_col[BCOMP] = (ti * (si * tex00[2] + sf * tex01[2]) + \
+ tf * (si * tex10[2] + sf * tex11[2])) >> 2 * FIXED_SHIFT;\
+ tmp_col[ACOMP] = (ti * (si * tex00[3] + sf * tex01[3]) + \
+ tf * (si * tex10[3] + sf * tex11[3])) >> 2 * FIXED_SHIFT
+
+#define MODULATE \
+ dest[RCOMP] = span->red * (tmp_col[RCOMP] + 1u) >> (FIXED_SHIFT + 8); \
+ dest[GCOMP] = span->green * (tmp_col[GCOMP] + 1u) >> (FIXED_SHIFT + 8); \
+ dest[BCOMP] = span->blue * (tmp_col[BCOMP] + 1u) >> (FIXED_SHIFT + 8); \
+ dest[ACOMP] = span->alpha * (tmp_col[ACOMP] + 1u) >> (FIXED_SHIFT + 8)
#define DECAL \
- dest[RCOMP] = ((CHAN_MAX - ta) * span->red \
- + ((ta + 1) * tr << FIXED_SHIFT)) >> (FIXED_SHIFT + 8); \
- dest[GCOMP] = ((CHAN_MAX - ta) * span->green \
- + ((ta + 1) * tg << FIXED_SHIFT)) >> (FIXED_SHIFT + 8); \
- dest[BCOMP] = ((CHAN_MAX - ta) * span->blue \
- + ((ta + 1) * tb << FIXED_SHIFT)) >> (FIXED_SHIFT + 8); \
- dest[ACOMP] = FixedToInt(span->alpha)
+ dest[RCOMP] = ((CHAN_MAX - tmp_col[ACOMP]) * span->red + \
+ ((tmp_col[ACOMP] + 1) * tmp_col[RCOMP] << FIXED_SHIFT)) \
+ >> (FIXED_SHIFT + 8); \
+ dest[GCOMP] = ((CHAN_MAX - tmp_col[ACOMP]) * span->green + \
+ ((tmp_col[ACOMP] + 1) * tmp_col[GCOMP] << FIXED_SHIFT)) \
+ >> (FIXED_SHIFT + 8); \
+ dest[BCOMP] = ((CHAN_MAX - tmp_col[ACOMP]) * span->blue + \
+ ((tmp_col[ACOMP] + 1) * tmp_col[BCOMP] << FIXED_SHIFT)) \
+ >> (FIXED_SHIFT + 8); \
+ dest[ACOMP] = FixedToInt(span->alpha)
#define BLEND \
- dest[RCOMP] = ((CHAN_MAX - tr) * span->red \
- + (tr + 1) * info->er) >> (FIXED_SHIFT + 8); \
- dest[GCOMP] = ((CHAN_MAX - tg) * span->green \
- + (tg + 1) * info->eg) >> (FIXED_SHIFT + 8); \
- dest[BCOMP] = ((CHAN_MAX - tb) * span->blue \
- + (tb + 1) * info->eb) >> (FIXED_SHIFT + 8); \
- dest[ACOMP] = span->alpha * (ta + 1) >> (FIXED_SHIFT + 8)
-
-#define REPLACE \
- dest[RCOMP] = tr; \
- dest[GCOMP] = tg; \
- dest[BCOMP] = tb; \
- dest[ACOMP] = ta
+ dest[RCOMP] = ((CHAN_MAX - tmp_col[RCOMP]) * span->red \
+ + (tmp_col[RCOMP] + 1) * info->er) >> (FIXED_SHIFT + 8); \
+ dest[GCOMP] = ((CHAN_MAX - tmp_col[GCOMP]) * span->green \
+ + (tmp_col[GCOMP] + 1) * info->eg) >> (FIXED_SHIFT + 8); \
+ dest[BCOMP] = ((CHAN_MAX - tmp_col[BCOMP]) * span->blue \
+ + (tmp_col[BCOMP] + 1) * info->eb) >> (FIXED_SHIFT + 8); \
+ dest[ACOMP] = span->alpha * (tmp_col[ACOMP] + 1) >> (FIXED_SHIFT + 8)
+
+#define REPLACE COPY_CHAN4(dest, tmp_col)
+
+#define I2CHAN_CLAMP(I) (GLchan) ((I) & CHAN_MAX)
+ /* equivalent to '(GLchan) MIN2((I),CHAN_MAX)' */
#define ADD \
- dest[RCOMP] = ((span->red << 8) \
- + (tr + 1) * info->er) >> (FIXED_SHIFT + 8); \
- dest[GCOMP] = ((span->green << 8) \
- + (tg + 1) * info->eg) >> (FIXED_SHIFT + 8); \
- dest[BCOMP] = ((span->blue << 8) \
- + (tb + 1) * info->eb) >> (FIXED_SHIFT + 8); \
- dest[ACOMP] = span->alpha * (ta + 1) >> (FIXED_SHIFT + 8)
+ dest[RCOMP] = MIN2(((span->red << 8) + \
+ (tmp_col[RCOMP] + 1) * info->er) \
+ >> (FIXED_SHIFT + 8), CHAN_MAX); \
+ dest[GCOMP] = MIN2(((span->green << 8) + \
+ (tmp_col[GCOMP] + 1) * info->eg) \
+ >> (FIXED_SHIFT + 8), CHAN_MAX); \
+ dest[RCOMP] = MIN2(((span->blue << 8) + \
+ (tmp_col[BCOMP] + 1) * info->eb) \
+ >> (FIXED_SHIFT + 8), CHAN_MAX); \
+ dest[ACOMP] = span->alpha * (tmp_col[ACOMP] + 1) >> (FIXED_SHIFT + 8)
/* shortcuts */
#define NEAREST_RGB_REPLACE NEAREST_RGB;REPLACE
-#define NEAREST_RGBA_REPLACE *(GLint *)dest = *(GLint *)tex00
+#define NEAREST_RGBA_REPLACE COPY_CHAN4(dest, tex00)
#define SPAN_NEAREST(DO_TEX,COMP) \
for (i = 0; i < span->count; i++) { \
fast_persp_span(GLcontext *ctx, struct triangle_span *span,
struct persp_info *info)
{
- GLint tr, tg, tb, ta;
+ GLchan tmp_col[4];
/* Instead of defining a function for each mode, a test is done
* between the outer and inner loops. This is to reduce code size
for (i = 0; i < span->count; i++) { \
GLdouble invQ = tex_coord[2] ? \
(1.0 / tex_coord[2]) : 1.0; \
- GLfloat s_tmp = tex_coord[0] * invQ - 0.5F; \
- GLfloat t_tmp = tex_coord[1] * invQ - 0.5F; \
- GLfixed s_fix = FloatToFixed(s_tmp); \
- GLfixed t_fix = FloatToFixed(t_tmp); \
+ GLfloat s_tmp = tex_coord[0] * invQ; \
+ GLfloat t_tmp = tex_coord[1] * invQ; \
+ GLfixed s_fix = FloatToFixed(s_tmp) - FIXED_HALF; \
+ GLfixed t_fix = FloatToFixed(t_tmp) - FIXED_HALF; \
GLint s = FixedToInt(FixedFloor(s_fix)) & info->smask; \
GLint t = FixedToInt(FixedFloor(t_fix)) & info->tmask; \
GLfixed sf = s_fix & FIXED_FRAC_MASK; \
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