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Diffstat (limited to 'src/mesa/swrast/s_span.c')
-rw-r--r--src/mesa/swrast/s_span.c145
1 files changed, 95 insertions, 50 deletions
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c
index 7f9cc64bb2..704230d1d7 100644
--- a/src/mesa/swrast/s_span.c
+++ b/src/mesa/swrast/s_span.c
@@ -1,8 +1,9 @@
/*
* Mesa 3-D graphics library
- * Version: 7.1
+ * Version: 7.5
*
- * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
+ * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -188,10 +189,10 @@ interpolate_active_attribs(GLcontext *ctx, SWspan *span, GLbitfield attrMask)
const GLfloat dv1dx = span->attrStepX[attr][1];
const GLfloat dv2dx = span->attrStepX[attr][2];
const GLfloat dv3dx = span->attrStepX[attr][3];
- GLfloat v0 = span->attrStart[attr][0];
- GLfloat v1 = span->attrStart[attr][1];
- GLfloat v2 = span->attrStart[attr][2];
- GLfloat v3 = span->attrStart[attr][3];
+ GLfloat v0 = span->attrStart[attr][0] + span->leftClip * dv0dx;
+ GLfloat v1 = span->attrStart[attr][1] + span->leftClip * dv1dx;
+ GLfloat v2 = span->attrStart[attr][2] + span->leftClip * dv2dx;
+ GLfloat v3 = span->attrStart[attr][3] + span->leftClip * dv3dx;
GLuint k;
for (k = 0; k < span->end; k++) {
const GLfloat invW = 1.0f / w;
@@ -442,11 +443,10 @@ _swrast_span_interpolate_z( const GLcontext *ctx, SWspan *span )
* Compute mipmap LOD from partial derivatives.
* This the ideal solution, as given in the OpenGL spec.
*/
-#if 0
-static GLfloat
-compute_lambda(GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy,
- GLfloat dqdx, GLfloat dqdy, GLfloat texW, GLfloat texH,
- GLfloat s, GLfloat t, GLfloat q, GLfloat invQ)
+GLfloat
+_swrast_compute_lambda(GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy,
+ GLfloat dqdx, GLfloat dqdy, GLfloat texW, GLfloat texH,
+ GLfloat s, GLfloat t, GLfloat q, GLfloat invQ)
{
GLfloat dudx = texW * ((s + dsdx) / (q + dqdx) - s * invQ);
GLfloat dvdx = texH * ((t + dtdx) / (q + dqdx) - t * invQ);
@@ -458,13 +458,13 @@ compute_lambda(GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy,
GLfloat lambda = LOG2(rho);
return lambda;
}
-#endif
/**
* Compute mipmap LOD from partial derivatives.
* This is a faster approximation than above function.
*/
+#if 0
GLfloat
_swrast_compute_lambda(GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy,
GLfloat dqdx, GLfloat dqdy, GLfloat texW, GLfloat texH,
@@ -485,6 +485,7 @@ _swrast_compute_lambda(GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy,
lambda = LOG2(rho);
return lambda;
}
+#endif
/**
@@ -521,10 +522,10 @@ interpolate_texcoords(GLcontext *ctx, SWspan *span)
const GLfloat drdx = span->attrStepX[attr][2];
const GLfloat dqdx = span->attrStepX[attr][3];
const GLfloat dqdy = span->attrStepY[attr][3];
- GLfloat s = span->attrStart[attr][0];
- GLfloat t = span->attrStart[attr][1];
- GLfloat r = span->attrStart[attr][2];
- GLfloat q = span->attrStart[attr][3];
+ GLfloat s = span->attrStart[attr][0] + span->leftClip * dsdx;
+ GLfloat t = span->attrStart[attr][1] + span->leftClip * dtdx;
+ GLfloat r = span->attrStart[attr][2] + span->leftClip * drdx;
+ GLfloat q = span->attrStart[attr][3] + span->leftClip * dqdx;
if (obj) {
const struct gl_texture_image *img = obj->Image[0][obj->BaseLevel];
@@ -546,7 +547,7 @@ interpolate_texcoords(GLcontext *ctx, SWspan *span)
|| ctx->ATIFragmentShader._Enabled) {
/* do perspective correction but don't divide s, t, r by q */
const GLfloat dwdx = span->attrStepX[FRAG_ATTRIB_WPOS][3];
- GLfloat w = span->attrStart[FRAG_ATTRIB_WPOS][3];
+ GLfloat w = span->attrStart[FRAG_ATTRIB_WPOS][3] + span->leftClip * dwdx;
for (i = 0; i < span->end; i++) {
const GLfloat invW = 1.0F / w;
texcoord[i][0] = s * invW;
@@ -587,7 +588,7 @@ interpolate_texcoords(GLcontext *ctx, SWspan *span)
ctx->ATIFragmentShader._Enabled) {
/* do perspective correction but don't divide s, t, r by q */
const GLfloat dwdx = span->attrStepX[FRAG_ATTRIB_WPOS][3];
- GLfloat w = span->attrStart[FRAG_ATTRIB_WPOS][3];
+ GLfloat w = span->attrStart[FRAG_ATTRIB_WPOS][3] + span->leftClip * dwdx;
for (i = 0; i < span->end; i++) {
const GLfloat invW = 1.0F / w;
texcoord[i][0] = s * invW;
@@ -660,8 +661,8 @@ interpolate_wpos(GLcontext *ctx, SWspan *span)
}
}
- w = span->attrStart[FRAG_ATTRIB_WPOS][3];
dw = span->attrStepX[FRAG_ATTRIB_WPOS][3];
+ w = span->attrStart[FRAG_ATTRIB_WPOS][3] + span->leftClip * dw;
for (i = 0; i < span->end; i++) {
wpos[i][2] = (GLfloat) span->array->z[i] * zScale;
wpos[i][3] = w;
@@ -726,6 +727,8 @@ clip_span( GLcontext *ctx, SWspan *span )
const GLint ymin = ctx->DrawBuffer->_Ymin;
const GLint ymax = ctx->DrawBuffer->_Ymax;
+ span->leftClip = 0;
+
if (span->arrayMask & SPAN_XY) {
/* arrays of x/y pixel coords */
const GLint *x = span->array->x;
@@ -753,7 +756,7 @@ clip_span( GLcontext *ctx, SWspan *span )
/* horizontal span of pixels */
const GLint x = span->x;
const GLint y = span->y;
- const GLint n = span->end;
+ GLint n = span->end;
/* Trivial rejection tests */
if (y < ymin || y >= ymax || x + n <= xmin || x >= xmax) {
@@ -761,18 +764,44 @@ clip_span( GLcontext *ctx, SWspan *span )
return GL_FALSE; /* all pixels clipped */
}
+ /* Clip to right */
+ if (x + n > xmax) {
+ ASSERT(x < xmax);
+ n = span->end = xmax - x;
+ }
+
/* Clip to the left */
if (x < xmin) {
+ const GLint leftClip = xmin - x;
+ GLuint i;
+
+ ASSERT(leftClip > 0);
ASSERT(x + n > xmin);
+
+ /* Clip 'leftClip' pixels from the left side.
+ * The span->leftClip field will be applied when we interpolate
+ * fragment attributes.
+ * For arrays of values, shift them left.
+ */
+ for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
+ if (span->arrayAttribs & (1 << i)) {
+ /* shift array elements left by 'leftClip' */
+ _mesa_memcpy(span->array->attribs[i],
+ span->array->attribs[i] + leftClip,
+ (n - leftClip) * 4 * sizeof(GLfloat));
+ }
+ }
+
+ span->leftClip = leftClip;
+ span->x = xmin;
+ span->end -= leftClip;
span->writeAll = GL_FALSE;
- _mesa_bzero(span->array->mask, (xmin - x) * sizeof(GLubyte));
}
- /* Clip to right */
- if (x + n > xmax) {
- ASSERT(x < xmax);
- span->end = xmax - x;
- }
+ ASSERT(span->x >= xmin);
+ ASSERT(span->x + span->end <= xmax);
+ ASSERT(span->y >= ymin);
+ ASSERT(span->y < ymax);
return GL_TRUE; /* some pixels visible */
}
@@ -818,6 +847,12 @@ _swrast_write_index_span( GLcontext *ctx, SWspan *span)
}
}
+ if (!(span->arrayMask & SPAN_MASK)) {
+ /* post-clip sanity check */
+ assert(span->x >= 0);
+ assert(span->y >= 0);
+ }
+
/* Depth bounds test */
if (ctx->Depth.BoundsTest && fb->Visual.depthBits > 0) {
if (!_swrast_depth_bounds_test(ctx, span)) {
@@ -845,12 +880,15 @@ _swrast_write_index_span( GLcontext *ctx, SWspan *span)
stipple_polygon_span(ctx, span);
}
+ if (ctx->Transform.DepthClamp)
+ _swrast_depth_clamp_span(ctx, span);
+
/* Stencil and Z testing */
- if (ctx->Depth.Test || ctx->Stencil.Enabled) {
+ if (ctx->Stencil._Enabled || ctx->Depth.Test) {
if (!(span->arrayMask & SPAN_Z))
_swrast_span_interpolate_z(ctx, span);
- if (ctx->Stencil.Enabled) {
+ if (ctx->Stencil._Enabled) {
if (!_swrast_stencil_and_ztest_span(ctx, span)) {
span->arrayMask = origArrayMask;
return;
@@ -866,7 +904,6 @@ _swrast_write_index_span( GLcontext *ctx, SWspan *span)
}
}
-#if FEATURE_ARB_occlusion_query
if (ctx->Query.CurrentOcclusionObject) {
/* update count of 'passed' fragments */
struct gl_query_object *q = ctx->Query.CurrentOcclusionObject;
@@ -874,7 +911,6 @@ _swrast_write_index_span( GLcontext *ctx, SWspan *span)
for (i = 0; i < span->end; i++)
q->Result += span->array->mask[i];
}
-#endif
/* we have to wait until after occlusion to do this test */
if (ctx->Color.IndexMask == 0) {
@@ -1211,7 +1247,7 @@ shade_texture_span(GLcontext *ctx, SWspan *span)
_swrast_exec_fragment_shader(ctx, span);
}
}
- else if (ctx->Texture._EnabledUnits) {
+ else if (ctx->Texture._EnabledCoordUnits) {
/* conventional texturing */
#if CHAN_BITS == 32
@@ -1250,7 +1286,7 @@ _swrast_write_rgba_span( GLcontext *ctx, SWspan *span)
void * const origRgba = span->array->rgba;
const GLboolean shader = (ctx->FragmentProgram._Current
|| ctx->ATIFragmentShader._Enabled);
- const GLboolean shaderOrTexture = shader || ctx->Texture._EnabledUnits;
+ const GLboolean shaderOrTexture = shader || ctx->Texture._EnabledCoordUnits;
struct gl_framebuffer *fb = ctx->DrawBuffer;
/*
@@ -1262,7 +1298,6 @@ _swrast_write_rgba_span( GLcontext *ctx, SWspan *span)
span->primitive == GL_LINE ||
span->primitive == GL_POLYGON ||
span->primitive == GL_BITMAP);
- ASSERT(span->end <= MAX_WIDTH);
/* Fragment write masks */
if (span->arrayMask & SPAN_MASK) {
@@ -1275,15 +1310,16 @@ _swrast_write_rgba_span( GLcontext *ctx, SWspan *span)
}
/* Clip to window/scissor box */
- if ((swrast->_RasterMask & CLIP_BIT) || (span->primitive != GL_POLYGON)) {
- if (!clip_span(ctx, span)) {
- return;
- }
+ if (!clip_span(ctx, span)) {
+ return;
}
+ ASSERT(span->end <= MAX_WIDTH);
+
#ifdef DEBUG
/* Make sure all fragments are within window bounds */
if (span->arrayMask & SPAN_XY) {
+ /* array of pixel locations */
GLuint i;
for (i = 0; i < span->end; i++) {
if (span->array->mask[i]) {
@@ -1311,18 +1347,19 @@ _swrast_write_rgba_span( GLcontext *ctx, SWspan *span)
/* Do the alpha test */
if (ctx->Color.AlphaEnabled) {
if (!_swrast_alpha_test(ctx, span)) {
+ /* all fragments failed test */
goto end;
}
}
/* Stencil and Z testing */
- if (ctx->Stencil.Enabled || ctx->Depth.Test) {
+ if (ctx->Stencil._Enabled || ctx->Depth.Test) {
if (!(span->arrayMask & SPAN_Z))
_swrast_span_interpolate_z(ctx, span);
-
- if (ctx->Stencil.Enabled && fb->Visual.stencilBits > 0) {
+ if (ctx->Stencil._Enabled) {
/* Combined Z/stencil tests */
if (!_swrast_stencil_and_ztest_span(ctx, span)) {
+ /* all fragments failed test */
goto end;
}
}
@@ -1331,12 +1368,12 @@ _swrast_write_rgba_span( GLcontext *ctx, SWspan *span)
ASSERT(ctx->Depth.Test);
ASSERT(span->arrayMask & SPAN_Z);
if (!_swrast_depth_test_span(ctx, span)) {
+ /* all fragments failed test */
goto end;
}
}
}
-#if FEATURE_ARB_occlusion_query
if (ctx->Query.CurrentOcclusionObject) {
/* update count of 'passed' fragments */
struct gl_query_object *q = ctx->Query.CurrentOcclusionObject;
@@ -1344,12 +1381,12 @@ _swrast_write_rgba_span( GLcontext *ctx, SWspan *span)
for (i = 0; i < span->end; i++)
q->Result += span->array->mask[i];
}
-#endif
/* We had to wait until now to check for glColorMask(0,0,0,0) because of
* the occlusion test.
*/
if (colorMask == 0x0) {
+ /* no colors to write */
goto end;
}
@@ -1373,12 +1410,14 @@ _swrast_write_rgba_span( GLcontext *ctx, SWspan *span)
ASSERT(span->arrayMask & SPAN_RGBA);
- if (!shader) {
- /* Add base and specular colors */
- if (ctx->Fog.ColorSumEnabled ||
- (ctx->Light.Enabled &&
- ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
- add_specular(ctx, span);
+ if (span->primitive == GL_BITMAP || !swrast->SpecularVertexAdd) {
+ /* Add primary and specular (diffuse + specular) colors */
+ if (!shader) {
+ if (ctx->Fog.ColorSumEnabled ||
+ (ctx->Light.Enabled &&
+ ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
+ add_specular(ctx, span);
+ }
}
}
@@ -1399,11 +1438,17 @@ _swrast_write_rgba_span( GLcontext *ctx, SWspan *span)
}
/*
- * Write to renderbuffers
+ * Write to renderbuffers.
+ * Depending on glDrawBuffer() state and the which color outputs are
+ * written by the fragment shader, we may either replicate one color to
+ * all renderbuffers or write a different color to each renderbuffer.
+ * multiFragOutputs=TRUE for the later case.
*/
{
const GLuint numBuffers = fb->_NumColorDrawBuffers;
- const GLboolean multiFragOutputs = numBuffers > 1;
+ const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
+ const GLboolean multiFragOutputs =
+ (fp && fp->Base.OutputsWritten >= (1 << FRAG_RESULT_DATA0));
GLuint buf;
for (buf = 0; buf < numBuffers; buf++) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-29 06:01:08 +0000