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Diffstat (limited to 'src/mesa/swrast/s_accum.c')
-rw-r--r--src/mesa/swrast/s_accum.c228
1 files changed, 118 insertions, 110 deletions
diff --git a/src/mesa/swrast/s_accum.c b/src/mesa/swrast/s_accum.c
index 21ac29153c..ff12c53050 100644
--- a/src/mesa/swrast/s_accum.c
+++ b/src/mesa/swrast/s_accum.c
@@ -1,4 +1,4 @@
-/* $Id: s_accum.c,v 1.1 2000/10/31 18:00:04 keithw Exp $ */
+/* $Id: s_accum.c,v 1.2 2000/11/05 18:24:40 keithw Exp $ */
/*
* Mesa 3-D graphics library
@@ -30,6 +30,7 @@
#include "mem.h"
#include "s_accum.h"
+#include "s_context.h"
#include "s_masking.h"
#include "s_span.h"
@@ -119,6 +120,116 @@ static void rescale_accum( GLcontext *ctx )
+
+
+
+/*
+ * Clear the accumulation Buffer.
+ */
+void
+_mesa_clear_accum_buffer( GLcontext *ctx )
+{
+ GLuint buffersize;
+ GLfloat acc_scale;
+
+ if (ctx->Visual.AccumRedBits==0) {
+ /* No accumulation buffer! */
+ return;
+ }
+
+ if (sizeof(GLaccum)==1) {
+ acc_scale = 127.0;
+ }
+ else if (sizeof(GLaccum)==2) {
+ acc_scale = 32767.0;
+ }
+ else {
+ /* sizeof(GLaccum) > 2 (Cray) */
+ acc_scale = (float) SHRT_MAX;
+ }
+
+ /* number of pixels */
+ buffersize = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
+
+ if (!ctx->DrawBuffer->Accum) {
+ /* try to alloc accumulation buffer */
+ ctx->DrawBuffer->Accum = (GLaccum *)
+ MALLOC( buffersize * 4 * sizeof(GLaccum) );
+ }
+
+ if (ctx->DrawBuffer->Accum) {
+ if (ctx->Scissor.Enabled) {
+ /* Limit clear to scissor box */
+ GLaccum r, g, b, a;
+ GLint i, j;
+ GLint width, height;
+ GLaccum *row;
+ r = (GLaccum) (ctx->Accum.ClearColor[0] * acc_scale);
+ g = (GLaccum) (ctx->Accum.ClearColor[1] * acc_scale);
+ b = (GLaccum) (ctx->Accum.ClearColor[2] * acc_scale);
+ a = (GLaccum) (ctx->Accum.ClearColor[3] * acc_scale);
+ /* size of region to clear */
+ width = 4 * (ctx->DrawBuffer->Xmax - ctx->DrawBuffer->Xmin);
+ height = ctx->DrawBuffer->Ymax - ctx->DrawBuffer->Ymin;
+ /* ptr to first element to clear */
+ row = ctx->DrawBuffer->Accum
+ + 4 * (ctx->DrawBuffer->Ymin * ctx->DrawBuffer->Width
+ + ctx->DrawBuffer->Xmin);
+ for (j=0;j<height;j++) {
+ for (i=0;i<width;i+=4) {
+ row[i+0] = r;
+ row[i+1] = g;
+ row[i+2] = b;
+ row[i+3] = a;
+ }
+ row += 4 * ctx->DrawBuffer->Width;
+ }
+ }
+ else {
+ /* clear whole buffer */
+ if (ctx->Accum.ClearColor[0]==0.0 &&
+ ctx->Accum.ClearColor[1]==0.0 &&
+ ctx->Accum.ClearColor[2]==0.0 &&
+ ctx->Accum.ClearColor[3]==0.0) {
+ /* Black */
+ BZERO( ctx->DrawBuffer->Accum, buffersize * 4 * sizeof(GLaccum) );
+ }
+ else {
+ /* Not black */
+ GLaccum *acc, r, g, b, a;
+ GLuint i;
+
+ acc = ctx->DrawBuffer->Accum;
+ r = (GLaccum) (ctx->Accum.ClearColor[0] * acc_scale);
+ g = (GLaccum) (ctx->Accum.ClearColor[1] * acc_scale);
+ b = (GLaccum) (ctx->Accum.ClearColor[2] * acc_scale);
+ a = (GLaccum) (ctx->Accum.ClearColor[3] * acc_scale);
+ for (i=0;i<buffersize;i++) {
+ *acc++ = r;
+ *acc++ = g;
+ *acc++ = b;
+ *acc++ = a;
+ }
+ }
+ }
+
+ /* update optimized accum state vars */
+ if (ctx->Accum.ClearColor[0] == 0.0 && ctx->Accum.ClearColor[1] == 0.0 &&
+ ctx->Accum.ClearColor[2] == 0.0 && ctx->Accum.ClearColor[3] == 0.0) {
+#ifdef USE_OPTIMIZED_ACCUM
+ ctx->IntegerAccumMode = GL_TRUE;
+#else
+ ctx->IntegerAccumMode = GL_FALSE;
+#endif
+ ctx->IntegerAccumScaler = 0.0; /* denotes empty accum buffer */
+ }
+ else {
+ ctx->IntegerAccumMode = GL_FALSE;
+ }
+ }
+}
+
+
void
_swrast_Accum( GLcontext *ctx, GLenum op, GLfloat value,
GLint xpos, GLint ypos,
@@ -133,8 +244,13 @@ _swrast_Accum( GLcontext *ctx, GLenum op, GLfloat value,
const GLfloat fChanMax = (1 << (sizeof(GLchan) * 8)) - 1;
+ if (SWRAST_CONTEXT(ctx)->NewState)
+ _swrast_validate_derived( ctx );
+
if (!ctx->DrawBuffer->Accum) {
- _mesa_warning(ctx, "Calling glAccum() without an accumulation buffer (low memory?)");
+ _mesa_warning(ctx,
+ "Calling glAccum() without an accumulation "
+ "buffer (low memory?)");
return;
}
@@ -389,111 +505,3 @@ _swrast_Accum( GLcontext *ctx, GLenum op, GLfloat value,
gl_error( ctx, GL_INVALID_ENUM, "glAccum" );
}
}
-
-
-
-/*
- * Clear the accumulation Buffer.
- */
-void
-_mesa_clear_accum_buffer( GLcontext *ctx )
-{
- GLuint buffersize;
- GLfloat acc_scale;
-
- if (ctx->Visual.AccumRedBits==0) {
- /* No accumulation buffer! */
- return;
- }
-
- if (sizeof(GLaccum)==1) {
- acc_scale = 127.0;
- }
- else if (sizeof(GLaccum)==2) {
- acc_scale = 32767.0;
- }
- else {
- /* sizeof(GLaccum) > 2 (Cray) */
- acc_scale = (float) SHRT_MAX;
- }
-
- /* number of pixels */
- buffersize = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
-
- if (!ctx->DrawBuffer->Accum) {
- /* try to alloc accumulation buffer */
- ctx->DrawBuffer->Accum = (GLaccum *)
- MALLOC( buffersize * 4 * sizeof(GLaccum) );
- }
-
- if (ctx->DrawBuffer->Accum) {
- if (ctx->Scissor.Enabled) {
- /* Limit clear to scissor box */
- GLaccum r, g, b, a;
- GLint i, j;
- GLint width, height;
- GLaccum *row;
- r = (GLaccum) (ctx->Accum.ClearColor[0] * acc_scale);
- g = (GLaccum) (ctx->Accum.ClearColor[1] * acc_scale);
- b = (GLaccum) (ctx->Accum.ClearColor[2] * acc_scale);
- a = (GLaccum) (ctx->Accum.ClearColor[3] * acc_scale);
- /* size of region to clear */
- width = 4 * (ctx->DrawBuffer->Xmax - ctx->DrawBuffer->Xmin);
- height = ctx->DrawBuffer->Ymax - ctx->DrawBuffer->Ymin;
- /* ptr to first element to clear */
- row = ctx->DrawBuffer->Accum
- + 4 * (ctx->DrawBuffer->Ymin * ctx->DrawBuffer->Width
- + ctx->DrawBuffer->Xmin);
- for (j=0;j<height;j++) {
- for (i=0;i<width;i+=4) {
- row[i+0] = r;
- row[i+1] = g;
- row[i+2] = b;
- row[i+3] = a;
- }
- row += 4 * ctx->DrawBuffer->Width;
- }
- }
- else {
- /* clear whole buffer */
- if (ctx->Accum.ClearColor[0]==0.0 &&
- ctx->Accum.ClearColor[1]==0.0 &&
- ctx->Accum.ClearColor[2]==0.0 &&
- ctx->Accum.ClearColor[3]==0.0) {
- /* Black */
- BZERO( ctx->DrawBuffer->Accum, buffersize * 4 * sizeof(GLaccum) );
- }
- else {
- /* Not black */
- GLaccum *acc, r, g, b, a;
- GLuint i;
-
- acc = ctx->DrawBuffer->Accum;
- r = (GLaccum) (ctx->Accum.ClearColor[0] * acc_scale);
- g = (GLaccum) (ctx->Accum.ClearColor[1] * acc_scale);
- b = (GLaccum) (ctx->Accum.ClearColor[2] * acc_scale);
- a = (GLaccum) (ctx->Accum.ClearColor[3] * acc_scale);
- for (i=0;i<buffersize;i++) {
- *acc++ = r;
- *acc++ = g;
- *acc++ = b;
- *acc++ = a;
- }
- }
- }
-
- /* update optimized accum state vars */
- if (ctx->Accum.ClearColor[0] == 0.0 && ctx->Accum.ClearColor[1] == 0.0 &&
- ctx->Accum.ClearColor[2] == 0.0 && ctx->Accum.ClearColor[3] == 0.0) {
-#ifdef USE_OPTIMIZED_ACCUM
- ctx->IntegerAccumMode = GL_TRUE;
-#else
- ctx->IntegerAccumMode = GL_FALSE;
-#endif
- ctx->IntegerAccumScaler = 0.0; /* denotes empty accum buffer */
- }
- else {
- ctx->IntegerAccumMode = GL_FALSE;
- }
- }
-}
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