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-rw-r--r--mesalib/src/mesa/swrast/s_blit.c1235
1 files changed, 616 insertions, 619 deletions
diff --git a/mesalib/src/mesa/swrast/s_blit.c b/mesalib/src/mesa/swrast/s_blit.c
index 2dd11399f..3516a41bf 100644
--- a/mesalib/src/mesa/swrast/s_blit.c
+++ b/mesalib/src/mesa/swrast/s_blit.c
@@ -1,619 +1,616 @@
-/*
- * Mesa 3-D graphics library
- * Version: 6.5
- *
- * Copyright (C) 1999-2006 Brian Paul 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"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-
-#include "main/glheader.h"
-#include "main/condrender.h"
-#include "main/image.h"
-#include "main/macros.h"
-#include "s_context.h"
-
-
-#define ABS(X) ((X) < 0 ? -(X) : (X))
-
-
-/**
- * Generate a row resampler function for GL_NEAREST mode.
- */
-#define RESAMPLE(NAME, PIXELTYPE, SIZE) \
-static void \
-NAME(GLint srcWidth, GLint dstWidth, \
- const GLvoid *srcBuffer, GLvoid *dstBuffer, \
- GLboolean flip) \
-{ \
- const PIXELTYPE *src = (const PIXELTYPE *) srcBuffer;\
- PIXELTYPE *dst = (PIXELTYPE *) dstBuffer; \
- GLint dstCol; \
- \
- if (flip) { \
- for (dstCol = 0; dstCol < dstWidth; dstCol++) { \
- GLint srcCol = (dstCol * srcWidth) / dstWidth; \
- ASSERT(srcCol >= 0); \
- ASSERT(srcCol < srcWidth); \
- srcCol = srcWidth - 1 - srcCol; /* flip */ \
- if (SIZE == 1) { \
- dst[dstCol] = src[srcCol]; \
- } \
- else if (SIZE == 2) { \
- dst[dstCol*2+0] = src[srcCol*2+0]; \
- dst[dstCol*2+1] = src[srcCol*2+1]; \
- } \
- else if (SIZE == 4) { \
- dst[dstCol*4+0] = src[srcCol*4+0]; \
- dst[dstCol*4+1] = src[srcCol*4+1]; \
- dst[dstCol*4+2] = src[srcCol*4+2]; \
- dst[dstCol*4+3] = src[srcCol*4+3]; \
- } \
- } \
- } \
- else { \
- for (dstCol = 0; dstCol < dstWidth; dstCol++) { \
- GLint srcCol = (dstCol * srcWidth) / dstWidth; \
- ASSERT(srcCol >= 0); \
- ASSERT(srcCol < srcWidth); \
- if (SIZE == 1) { \
- dst[dstCol] = src[srcCol]; \
- } \
- else if (SIZE == 2) { \
- dst[dstCol*2+0] = src[srcCol*2+0]; \
- dst[dstCol*2+1] = src[srcCol*2+1]; \
- } \
- else if (SIZE == 4) { \
- dst[dstCol*4+0] = src[srcCol*4+0]; \
- dst[dstCol*4+1] = src[srcCol*4+1]; \
- dst[dstCol*4+2] = src[srcCol*4+2]; \
- dst[dstCol*4+3] = src[srcCol*4+3]; \
- } \
- } \
- } \
-}
-
-/**
- * Resamplers for 1, 2, 4, 8 and 16-byte pixels.
- */
-RESAMPLE(resample_row_1, GLubyte, 1)
-RESAMPLE(resample_row_2, GLushort, 1)
-RESAMPLE(resample_row_4, GLuint, 1)
-RESAMPLE(resample_row_8, GLuint, 2)
-RESAMPLE(resample_row_16, GLuint, 4)
-
-
-/**
- * Blit color, depth or stencil with GL_NEAREST filtering.
- */
-static void
-blit_nearest(struct gl_context *ctx,
- GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
- GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
- GLbitfield buffer)
-{
- struct gl_renderbuffer *readRb, *drawRb;
-
- const GLint srcWidth = ABS(srcX1 - srcX0);
- const GLint dstWidth = ABS(dstX1 - dstX0);
- const GLint srcHeight = ABS(srcY1 - srcY0);
- const GLint dstHeight = ABS(dstY1 - dstY0);
-
- const GLint srcXpos = MIN2(srcX0, srcX1);
- const GLint srcYpos = MIN2(srcY0, srcY1);
- const GLint dstXpos = MIN2(dstX0, dstX1);
- const GLint dstYpos = MIN2(dstY0, dstY1);
-
- const GLboolean invertX = (srcX1 < srcX0) ^ (dstX1 < dstX0);
- const GLboolean invertY = (srcY1 < srcY0) ^ (dstY1 < dstY0);
-
- GLint dstRow;
-
- GLint comps, pixelSize;
- GLvoid *srcBuffer, *dstBuffer;
- GLint prevY = -1;
-
- typedef void (*resample_func)(GLint srcWidth, GLint dstWidth,
- const GLvoid *srcBuffer, GLvoid *dstBuffer,
- GLboolean flip);
- resample_func resampleRow;
-
- switch (buffer) {
- case GL_COLOR_BUFFER_BIT:
- readRb = ctx->ReadBuffer->_ColorReadBuffer;
- drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0];
- comps = 4;
- break;
- case GL_DEPTH_BUFFER_BIT:
- readRb = ctx->ReadBuffer->_DepthBuffer;
- drawRb = ctx->DrawBuffer->_DepthBuffer;
- comps = 1;
- break;
- case GL_STENCIL_BUFFER_BIT:
- readRb = ctx->ReadBuffer->_StencilBuffer;
- drawRb = ctx->DrawBuffer->_StencilBuffer;
- comps = 1;
- break;
- default:
- _mesa_problem(ctx, "unexpected buffer in blit_nearest()");
- return;
- }
-
- switch (readRb->DataType) {
- case GL_UNSIGNED_BYTE:
- pixelSize = comps * sizeof(GLubyte);
- break;
- case GL_UNSIGNED_SHORT:
- pixelSize = comps * sizeof(GLushort);
- break;
- case GL_UNSIGNED_INT:
- pixelSize = comps * sizeof(GLuint);
- break;
- case GL_FLOAT:
- pixelSize = comps * sizeof(GLfloat);
- break;
- default:
- _mesa_problem(ctx, "unexpected buffer type (0x%x) in blit_nearest",
- readRb->DataType);
- return;
- }
-
- /* choose row resampler */
- switch (pixelSize) {
- case 1:
- resampleRow = resample_row_1;
- break;
- case 2:
- resampleRow = resample_row_2;
- break;
- case 4:
- resampleRow = resample_row_4;
- break;
- case 8:
- resampleRow = resample_row_8;
- break;
- case 16:
- resampleRow = resample_row_16;
- break;
- default:
- _mesa_problem(ctx, "unexpected pixel size (%d) in blit_nearest",
- pixelSize);
- return;
- }
-
- /* allocate the src/dst row buffers */
- srcBuffer = malloc(pixelSize * srcWidth);
- if (!srcBuffer) {
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
- return;
- }
- dstBuffer = malloc(pixelSize * dstWidth);
- if (!dstBuffer) {
- free(srcBuffer);
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
- return;
- }
-
- for (dstRow = 0; dstRow < dstHeight; dstRow++) {
- const GLint dstY = dstYpos + dstRow;
- GLint srcRow = (dstRow * srcHeight) / dstHeight;
- GLint srcY;
-
- ASSERT(srcRow >= 0);
- ASSERT(srcRow < srcHeight);
-
- if (invertY) {
- srcRow = srcHeight - 1 - srcRow;
- }
-
- srcY = srcYpos + srcRow;
-
- /* get pixel row from source and resample to match dest width */
- if (prevY != srcY) {
- readRb->GetRow(ctx, readRb, srcWidth, srcXpos, srcY, srcBuffer);
- (*resampleRow)(srcWidth, dstWidth, srcBuffer, dstBuffer, invertX);
- prevY = srcY;
- }
-
- /* store pixel row in destination */
- drawRb->PutRow(ctx, drawRb, dstWidth, dstXpos, dstY, dstBuffer, NULL);
- }
-
- free(srcBuffer);
- free(dstBuffer);
-}
-
-
-
-#define LERP(T, A, B) ( (A) + (T) * ((B) - (A)) )
-
-static INLINE GLfloat
-lerp_2d(GLfloat a, GLfloat b,
- GLfloat v00, GLfloat v10, GLfloat v01, GLfloat v11)
-{
- const GLfloat temp0 = LERP(a, v00, v10);
- const GLfloat temp1 = LERP(a, v01, v11);
- return LERP(b, temp0, temp1);
-}
-
-
-/**
- * Bilinear interpolation of two source rows.
- * GLubyte pixels.
- */
-static void
-resample_linear_row_ub(GLint srcWidth, GLint dstWidth,
- const GLvoid *srcBuffer0, const GLvoid *srcBuffer1,
- GLvoid *dstBuffer, GLboolean flip, GLfloat rowWeight)
-{
- const GLubyte (*srcColor0)[4] = (const GLubyte (*)[4]) srcBuffer0;
- const GLubyte (*srcColor1)[4] = (const GLubyte (*)[4]) srcBuffer1;
- GLubyte (*dstColor)[4] = (GLubyte (*)[4]) dstBuffer;
- const GLfloat dstWidthF = (GLfloat) dstWidth;
- GLint dstCol;
-
- for (dstCol = 0; dstCol < dstWidth; dstCol++) {
- const GLfloat srcCol = (dstCol * srcWidth) / dstWidthF;
- GLint srcCol0 = IFLOOR(srcCol);
- GLint srcCol1 = srcCol0 + 1;
- GLfloat colWeight = srcCol - srcCol0; /* fractional part of srcCol */
- GLfloat red, green, blue, alpha;
-
- ASSERT(srcCol0 >= 0);
- ASSERT(srcCol0 < srcWidth);
- ASSERT(srcCol1 <= srcWidth);
-
- if (srcCol1 == srcWidth) {
- /* last column fudge */
- srcCol1--;
- colWeight = 0.0;
- }
-
- if (flip) {
- srcCol0 = srcWidth - 1 - srcCol0;
- srcCol1 = srcWidth - 1 - srcCol1;
- }
-
- red = lerp_2d(colWeight, rowWeight,
- srcColor0[srcCol0][RCOMP], srcColor0[srcCol1][RCOMP],
- srcColor1[srcCol0][RCOMP], srcColor1[srcCol1][RCOMP]);
- green = lerp_2d(colWeight, rowWeight,
- srcColor0[srcCol0][GCOMP], srcColor0[srcCol1][GCOMP],
- srcColor1[srcCol0][GCOMP], srcColor1[srcCol1][GCOMP]);
- blue = lerp_2d(colWeight, rowWeight,
- srcColor0[srcCol0][BCOMP], srcColor0[srcCol1][BCOMP],
- srcColor1[srcCol0][BCOMP], srcColor1[srcCol1][BCOMP]);
- alpha = lerp_2d(colWeight, rowWeight,
- srcColor0[srcCol0][ACOMP], srcColor0[srcCol1][ACOMP],
- srcColor1[srcCol0][ACOMP], srcColor1[srcCol1][ACOMP]);
-
- dstColor[dstCol][RCOMP] = IFLOOR(red);
- dstColor[dstCol][GCOMP] = IFLOOR(green);
- dstColor[dstCol][BCOMP] = IFLOOR(blue);
- dstColor[dstCol][ACOMP] = IFLOOR(alpha);
- }
-}
-
-
-
-/**
- * Bilinear filtered blit (color only).
- */
-static void
-blit_linear(struct gl_context *ctx,
- GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
- GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1)
-{
- struct gl_renderbuffer *readRb = ctx->ReadBuffer->_ColorReadBuffer;
- struct gl_renderbuffer *drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0];
-
- const GLint srcWidth = ABS(srcX1 - srcX0);
- const GLint dstWidth = ABS(dstX1 - dstX0);
- const GLint srcHeight = ABS(srcY1 - srcY0);
- const GLint dstHeight = ABS(dstY1 - dstY0);
- const GLfloat dstHeightF = (GLfloat) dstHeight;
-
- const GLint srcXpos = MIN2(srcX0, srcX1);
- const GLint srcYpos = MIN2(srcY0, srcY1);
- const GLint dstXpos = MIN2(dstX0, dstX1);
- const GLint dstYpos = MIN2(dstY0, dstY1);
-
- const GLboolean invertX = (srcX1 < srcX0) ^ (dstX1 < dstX0);
- const GLboolean invertY = (srcY1 < srcY0) ^ (dstY1 < dstY0);
-
- GLint dstRow;
-
- GLint pixelSize;
- GLvoid *srcBuffer0, *srcBuffer1;
- GLint srcBufferY0 = -1, srcBufferY1 = -1;
- GLvoid *dstBuffer;
-
- switch (readRb->DataType) {
- case GL_UNSIGNED_BYTE:
- pixelSize = 4 * sizeof(GLubyte);
- break;
- case GL_UNSIGNED_SHORT:
- pixelSize = 4 * sizeof(GLushort);
- break;
- case GL_UNSIGNED_INT:
- pixelSize = 4 * sizeof(GLuint);
- break;
- case GL_FLOAT:
- pixelSize = 4 * sizeof(GLfloat);
- break;
- default:
- _mesa_problem(ctx, "unexpected buffer type (0x%x) in blit_nearest",
- readRb->DataType);
- return;
- }
-
- /* Allocate the src/dst row buffers.
- * Keep two adjacent src rows around for bilinear sampling.
- */
- srcBuffer0 = malloc(pixelSize * srcWidth);
- if (!srcBuffer0) {
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
- return;
- }
- srcBuffer1 = malloc(pixelSize * srcWidth);
- if (!srcBuffer1) {
- free(srcBuffer0);
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
- return;
- }
- dstBuffer = malloc(pixelSize * dstWidth);
- if (!dstBuffer) {
- free(srcBuffer0);
- free(srcBuffer1);
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
- return;
- }
-
- for (dstRow = 0; dstRow < dstHeight; dstRow++) {
- const GLint dstY = dstYpos + dstRow;
- const GLfloat srcRow = (dstRow * srcHeight) / dstHeightF;
- GLint srcRow0 = IFLOOR(srcRow);
- GLint srcRow1 = srcRow0 + 1;
- GLfloat rowWeight = srcRow - srcRow0; /* fractional part of srcRow */
-
- ASSERT(srcRow >= 0);
- ASSERT(srcRow < srcHeight);
-
- if (srcRow1 == srcHeight) {
- /* last row fudge */
- srcRow1 = srcRow0;
- rowWeight = 0.0;
- }
-
- if (invertY) {
- srcRow0 = srcHeight - 1 - srcRow0;
- srcRow1 = srcHeight - 1 - srcRow1;
- }
-
- srcY0 = srcYpos + srcRow0;
- srcY1 = srcYpos + srcRow1;
-
- /* get the two source rows */
- if (srcY0 == srcBufferY0 && srcY1 == srcBufferY1) {
- /* use same source row buffers again */
- }
- else if (srcY0 == srcBufferY1) {
- /* move buffer1 into buffer0 by swapping pointers */
- GLvoid *tmp = srcBuffer0;
- srcBuffer0 = srcBuffer1;
- srcBuffer1 = tmp;
- /* get y1 row */
- readRb->GetRow(ctx, readRb, srcWidth, srcXpos, srcY1, srcBuffer1);
- srcBufferY0 = srcY0;
- srcBufferY1 = srcY1;
- }
- else {
- /* get both new rows */
- readRb->GetRow(ctx, readRb, srcWidth, srcXpos, srcY0, srcBuffer0);
- readRb->GetRow(ctx, readRb, srcWidth, srcXpos, srcY1, srcBuffer1);
- srcBufferY0 = srcY0;
- srcBufferY1 = srcY1;
- }
-
- if (readRb->DataType == GL_UNSIGNED_BYTE) {
- resample_linear_row_ub(srcWidth, dstWidth, srcBuffer0, srcBuffer1,
- dstBuffer, invertX, rowWeight);
- }
- else {
- _mesa_problem(ctx, "Unsupported color channel type in sw blit");
- break;
- }
-
- /* store pixel row in destination */
- drawRb->PutRow(ctx, drawRb, dstWidth, dstXpos, dstY, dstBuffer, NULL);
- }
-
- free(srcBuffer0);
- free(srcBuffer1);
- free(dstBuffer);
-}
-
-
-/**
- * Simple case: Blit color, depth or stencil with no scaling or flipping.
- * XXX we could easily support vertical flipping here.
- */
-static void
-simple_blit(struct gl_context *ctx,
- GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
- GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
- GLbitfield buffer)
-{
- struct gl_renderbuffer *readRb, *drawRb;
- const GLint width = srcX1 - srcX0;
- const GLint height = srcY1 - srcY0;
- GLint row, srcY, dstY, yStep;
- GLint comps, bytesPerRow;
- void *rowBuffer;
-
- /* only one buffer */
- ASSERT(_mesa_bitcount(buffer) == 1);
- /* no flipping checks */
- ASSERT(srcX0 < srcX1);
- ASSERT(srcY0 < srcY1);
- ASSERT(dstX0 < dstX1);
- ASSERT(dstY0 < dstY1);
- /* size checks */
- ASSERT(srcX1 - srcX0 == dstX1 - dstX0);
- ASSERT(srcY1 - srcY0 == dstY1 - dstY0);
-
- /* determine if copy should be bottom-to-top or top-to-bottom */
- if (srcY0 > dstY0) {
- /* src above dst: copy bottom-to-top */
- yStep = 1;
- srcY = srcY0;
- dstY = dstY0;
- }
- else {
- /* src below dst: copy top-to-bottom */
- yStep = -1;
- srcY = srcY1 - 1;
- dstY = dstY1 - 1;
- }
-
- switch (buffer) {
- case GL_COLOR_BUFFER_BIT:
- readRb = ctx->ReadBuffer->_ColorReadBuffer;
- drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0];
- comps = 4;
- break;
- case GL_DEPTH_BUFFER_BIT:
- readRb = ctx->ReadBuffer->_DepthBuffer;
- drawRb = ctx->DrawBuffer->_DepthBuffer;
- comps = 1;
- break;
- case GL_STENCIL_BUFFER_BIT:
- readRb = ctx->ReadBuffer->_StencilBuffer;
- drawRb = ctx->DrawBuffer->_StencilBuffer;
- comps = 1;
- break;
- default:
- _mesa_problem(ctx, "unexpected buffer in simple_blit()");
- return;
- }
-
- ASSERT(readRb->DataType == drawRb->DataType);
-
- /* compute bytes per row */
- switch (readRb->DataType) {
- case GL_UNSIGNED_BYTE:
- bytesPerRow = comps * width * sizeof(GLubyte);
- break;
- case GL_UNSIGNED_SHORT:
- bytesPerRow = comps * width * sizeof(GLushort);
- break;
- case GL_UNSIGNED_INT:
- bytesPerRow = comps * width * sizeof(GLuint);
- break;
- case GL_FLOAT:
- bytesPerRow = comps * width * sizeof(GLfloat);
- break;
- default:
- _mesa_problem(ctx, "unexpected buffer type in simple_blit");
- return;
- }
-
- /* allocate the row buffer */
- rowBuffer = malloc(bytesPerRow);
- if (!rowBuffer) {
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
- return;
- }
-
- for (row = 0; row < height; row++) {
- readRb->GetRow(ctx, readRb, width, srcX0, srcY, rowBuffer);
- drawRb->PutRow(ctx, drawRb, width, dstX0, dstY, rowBuffer, NULL);
- srcY += yStep;
- dstY += yStep;
- }
-
- free(rowBuffer);
-}
-
-
-/**
- * Software fallback for glBlitFramebufferEXT().
- */
-void
-_swrast_BlitFramebuffer(struct gl_context *ctx,
- GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
- GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
- GLbitfield mask, GLenum filter)
-{
- static const GLbitfield buffers[3] = {
- GL_COLOR_BUFFER_BIT,
- GL_DEPTH_BUFFER_BIT,
- GL_STENCIL_BUFFER_BIT
- };
- GLint i;
-
- if (!_mesa_check_conditional_render(ctx))
- return; /* don't clear */
-
- if (!ctx->DrawBuffer->_NumColorDrawBuffers)
- return;
-
- if (!_mesa_clip_blit(ctx, &srcX0, &srcY0, &srcX1, &srcY1,
- &dstX0, &dstY0, &dstX1, &dstY1)) {
- return;
- }
-
- swrast_render_start(ctx);
-
- if (srcX1 - srcX0 == dstX1 - dstX0 &&
- srcY1 - srcY0 == dstY1 - dstY0 &&
- srcX0 < srcX1 &&
- srcY0 < srcY1 &&
- dstX0 < dstX1 &&
- dstY0 < dstY1) {
- /* no stretching or flipping.
- * filter doesn't matter.
- */
- for (i = 0; i < 3; i++) {
- if (mask & buffers[i]) {
- simple_blit(ctx, srcX0, srcY0, srcX1, srcY1,
- dstX0, dstY0, dstX1, dstY1, buffers[i]);
- }
- }
- }
- else {
- if (filter == GL_NEAREST) {
- for (i = 0; i < 3; i++) {
- if (mask & buffers[i]) {
- blit_nearest(ctx, srcX0, srcY0, srcX1, srcY1,
- dstX0, dstY0, dstX1, dstY1, buffers[i]);
- }
- }
- }
- else {
- ASSERT(filter == GL_LINEAR);
- if (mask & GL_COLOR_BUFFER_BIT) { /* depth/stencil not allowed */
- blit_linear(ctx, srcX0, srcY0, srcX1, srcY1,
- dstX0, dstY0, dstX1, dstY1);
- }
- }
- }
-
- swrast_render_finish(ctx);
-}
+/*
+ * Mesa 3-D graphics library
+ * Version: 6.5
+ *
+ * Copyright (C) 1999-2006 Brian Paul 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"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+#include "main/glheader.h"
+#include "main/condrender.h"
+#include "main/image.h"
+#include "main/macros.h"
+#include "s_context.h"
+
+
+#define ABS(X) ((X) < 0 ? -(X) : (X))
+
+
+/**
+ * Generate a row resampler function for GL_NEAREST mode.
+ */
+#define RESAMPLE(NAME, PIXELTYPE, SIZE) \
+static void \
+NAME(GLint srcWidth, GLint dstWidth, \
+ const GLvoid *srcBuffer, GLvoid *dstBuffer, \
+ GLboolean flip) \
+{ \
+ const PIXELTYPE *src = (const PIXELTYPE *) srcBuffer;\
+ PIXELTYPE *dst = (PIXELTYPE *) dstBuffer; \
+ GLint dstCol; \
+ \
+ if (flip) { \
+ for (dstCol = 0; dstCol < dstWidth; dstCol++) { \
+ GLint srcCol = (dstCol * srcWidth) / dstWidth; \
+ ASSERT(srcCol >= 0); \
+ ASSERT(srcCol < srcWidth); \
+ srcCol = srcWidth - 1 - srcCol; /* flip */ \
+ if (SIZE == 1) { \
+ dst[dstCol] = src[srcCol]; \
+ } \
+ else if (SIZE == 2) { \
+ dst[dstCol*2+0] = src[srcCol*2+0]; \
+ dst[dstCol*2+1] = src[srcCol*2+1]; \
+ } \
+ else if (SIZE == 4) { \
+ dst[dstCol*4+0] = src[srcCol*4+0]; \
+ dst[dstCol*4+1] = src[srcCol*4+1]; \
+ dst[dstCol*4+2] = src[srcCol*4+2]; \
+ dst[dstCol*4+3] = src[srcCol*4+3]; \
+ } \
+ } \
+ } \
+ else { \
+ for (dstCol = 0; dstCol < dstWidth; dstCol++) { \
+ GLint srcCol = (dstCol * srcWidth) / dstWidth; \
+ ASSERT(srcCol >= 0); \
+ ASSERT(srcCol < srcWidth); \
+ if (SIZE == 1) { \
+ dst[dstCol] = src[srcCol]; \
+ } \
+ else if (SIZE == 2) { \
+ dst[dstCol*2+0] = src[srcCol*2+0]; \
+ dst[dstCol*2+1] = src[srcCol*2+1]; \
+ } \
+ else if (SIZE == 4) { \
+ dst[dstCol*4+0] = src[srcCol*4+0]; \
+ dst[dstCol*4+1] = src[srcCol*4+1]; \
+ dst[dstCol*4+2] = src[srcCol*4+2]; \
+ dst[dstCol*4+3] = src[srcCol*4+3]; \
+ } \
+ } \
+ } \
+}
+
+/**
+ * Resamplers for 1, 2, 4, 8 and 16-byte pixels.
+ */
+RESAMPLE(resample_row_1, GLubyte, 1)
+RESAMPLE(resample_row_2, GLushort, 1)
+RESAMPLE(resample_row_4, GLuint, 1)
+RESAMPLE(resample_row_8, GLuint, 2)
+RESAMPLE(resample_row_16, GLuint, 4)
+
+
+/**
+ * Blit color, depth or stencil with GL_NEAREST filtering.
+ */
+static void
+blit_nearest(struct gl_context *ctx,
+ GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
+ GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
+ GLbitfield buffer)
+{
+ struct gl_renderbuffer *readRb, *drawRb;
+
+ const GLint srcWidth = ABS(srcX1 - srcX0);
+ const GLint dstWidth = ABS(dstX1 - dstX0);
+ const GLint srcHeight = ABS(srcY1 - srcY0);
+ const GLint dstHeight = ABS(dstY1 - dstY0);
+
+ const GLint srcXpos = MIN2(srcX0, srcX1);
+ const GLint srcYpos = MIN2(srcY0, srcY1);
+ const GLint dstXpos = MIN2(dstX0, dstX1);
+ const GLint dstYpos = MIN2(dstY0, dstY1);
+
+ const GLboolean invertX = (srcX1 < srcX0) ^ (dstX1 < dstX0);
+ const GLboolean invertY = (srcY1 < srcY0) ^ (dstY1 < dstY0);
+
+ GLint dstRow;
+
+ GLint comps, pixelSize;
+ GLvoid *srcBuffer, *dstBuffer;
+ GLint prevY = -1;
+
+ typedef void (*resample_func)(GLint srcWidth, GLint dstWidth,
+ const GLvoid *srcBuffer, GLvoid *dstBuffer,
+ GLboolean flip);
+ resample_func resampleRow;
+
+ switch (buffer) {
+ case GL_COLOR_BUFFER_BIT:
+ readRb = ctx->ReadBuffer->_ColorReadBuffer;
+ drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0];
+ comps = 4;
+ break;
+ case GL_DEPTH_BUFFER_BIT:
+ readRb = ctx->ReadBuffer->_DepthBuffer;
+ drawRb = ctx->DrawBuffer->_DepthBuffer;
+ comps = 1;
+ break;
+ case GL_STENCIL_BUFFER_BIT:
+ readRb = ctx->ReadBuffer->_StencilBuffer;
+ drawRb = ctx->DrawBuffer->_StencilBuffer;
+ comps = 1;
+ break;
+ default:
+ _mesa_problem(ctx, "unexpected buffer in blit_nearest()");
+ return;
+ }
+
+ switch (readRb->DataType) {
+ case GL_UNSIGNED_BYTE:
+ pixelSize = comps * sizeof(GLubyte);
+ break;
+ case GL_UNSIGNED_SHORT:
+ pixelSize = comps * sizeof(GLushort);
+ break;
+ case GL_UNSIGNED_INT:
+ pixelSize = comps * sizeof(GLuint);
+ break;
+ case GL_FLOAT:
+ pixelSize = comps * sizeof(GLfloat);
+ break;
+ default:
+ _mesa_problem(ctx, "unexpected buffer type (0x%x) in blit_nearest",
+ readRb->DataType);
+ return;
+ }
+
+ /* choose row resampler */
+ switch (pixelSize) {
+ case 1:
+ resampleRow = resample_row_1;
+ break;
+ case 2:
+ resampleRow = resample_row_2;
+ break;
+ case 4:
+ resampleRow = resample_row_4;
+ break;
+ case 8:
+ resampleRow = resample_row_8;
+ break;
+ case 16:
+ resampleRow = resample_row_16;
+ break;
+ default:
+ _mesa_problem(ctx, "unexpected pixel size (%d) in blit_nearest",
+ pixelSize);
+ return;
+ }
+
+ /* allocate the src/dst row buffers */
+ srcBuffer = malloc(pixelSize * srcWidth);
+ if (!srcBuffer) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
+ return;
+ }
+ dstBuffer = malloc(pixelSize * dstWidth);
+ if (!dstBuffer) {
+ free(srcBuffer);
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
+ return;
+ }
+
+ for (dstRow = 0; dstRow < dstHeight; dstRow++) {
+ const GLint dstY = dstYpos + dstRow;
+ GLint srcRow = (dstRow * srcHeight) / dstHeight;
+ GLint srcY;
+
+ ASSERT(srcRow >= 0);
+ ASSERT(srcRow < srcHeight);
+
+ if (invertY) {
+ srcRow = srcHeight - 1 - srcRow;
+ }
+
+ srcY = srcYpos + srcRow;
+
+ /* get pixel row from source and resample to match dest width */
+ if (prevY != srcY) {
+ readRb->GetRow(ctx, readRb, srcWidth, srcXpos, srcY, srcBuffer);
+ (*resampleRow)(srcWidth, dstWidth, srcBuffer, dstBuffer, invertX);
+ prevY = srcY;
+ }
+
+ /* store pixel row in destination */
+ drawRb->PutRow(ctx, drawRb, dstWidth, dstXpos, dstY, dstBuffer, NULL);
+ }
+
+ free(srcBuffer);
+ free(dstBuffer);
+}
+
+
+
+#define LERP(T, A, B) ( (A) + (T) * ((B) - (A)) )
+
+static INLINE GLfloat
+lerp_2d(GLfloat a, GLfloat b,
+ GLfloat v00, GLfloat v10, GLfloat v01, GLfloat v11)
+{
+ const GLfloat temp0 = LERP(a, v00, v10);
+ const GLfloat temp1 = LERP(a, v01, v11);
+ return LERP(b, temp0, temp1);
+}
+
+
+/**
+ * Bilinear interpolation of two source rows.
+ * GLubyte pixels.
+ */
+static void
+resample_linear_row_ub(GLint srcWidth, GLint dstWidth,
+ const GLvoid *srcBuffer0, const GLvoid *srcBuffer1,
+ GLvoid *dstBuffer, GLboolean flip, GLfloat rowWeight)
+{
+ const GLubyte (*srcColor0)[4] = (const GLubyte (*)[4]) srcBuffer0;
+ const GLubyte (*srcColor1)[4] = (const GLubyte (*)[4]) srcBuffer1;
+ GLubyte (*dstColor)[4] = (GLubyte (*)[4]) dstBuffer;
+ const GLfloat dstWidthF = (GLfloat) dstWidth;
+ GLint dstCol;
+
+ for (dstCol = 0; dstCol < dstWidth; dstCol++) {
+ const GLfloat srcCol = (dstCol * srcWidth) / dstWidthF;
+ GLint srcCol0 = IFLOOR(srcCol);
+ GLint srcCol1 = srcCol0 + 1;
+ GLfloat colWeight = srcCol - srcCol0; /* fractional part of srcCol */
+ GLfloat red, green, blue, alpha;
+
+ ASSERT(srcCol0 >= 0);
+ ASSERT(srcCol0 < srcWidth);
+ ASSERT(srcCol1 <= srcWidth);
+
+ if (srcCol1 == srcWidth) {
+ /* last column fudge */
+ srcCol1--;
+ colWeight = 0.0;
+ }
+
+ if (flip) {
+ srcCol0 = srcWidth - 1 - srcCol0;
+ srcCol1 = srcWidth - 1 - srcCol1;
+ }
+
+ red = lerp_2d(colWeight, rowWeight,
+ srcColor0[srcCol0][RCOMP], srcColor0[srcCol1][RCOMP],
+ srcColor1[srcCol0][RCOMP], srcColor1[srcCol1][RCOMP]);
+ green = lerp_2d(colWeight, rowWeight,
+ srcColor0[srcCol0][GCOMP], srcColor0[srcCol1][GCOMP],
+ srcColor1[srcCol0][GCOMP], srcColor1[srcCol1][GCOMP]);
+ blue = lerp_2d(colWeight, rowWeight,
+ srcColor0[srcCol0][BCOMP], srcColor0[srcCol1][BCOMP],
+ srcColor1[srcCol0][BCOMP], srcColor1[srcCol1][BCOMP]);
+ alpha = lerp_2d(colWeight, rowWeight,
+ srcColor0[srcCol0][ACOMP], srcColor0[srcCol1][ACOMP],
+ srcColor1[srcCol0][ACOMP], srcColor1[srcCol1][ACOMP]);
+
+ dstColor[dstCol][RCOMP] = IFLOOR(red);
+ dstColor[dstCol][GCOMP] = IFLOOR(green);
+ dstColor[dstCol][BCOMP] = IFLOOR(blue);
+ dstColor[dstCol][ACOMP] = IFLOOR(alpha);
+ }
+}
+
+
+
+/**
+ * Bilinear filtered blit (color only).
+ */
+static void
+blit_linear(struct gl_context *ctx,
+ GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
+ GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1)
+{
+ struct gl_renderbuffer *readRb = ctx->ReadBuffer->_ColorReadBuffer;
+ struct gl_renderbuffer *drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0];
+
+ const GLint srcWidth = ABS(srcX1 - srcX0);
+ const GLint dstWidth = ABS(dstX1 - dstX0);
+ const GLint srcHeight = ABS(srcY1 - srcY0);
+ const GLint dstHeight = ABS(dstY1 - dstY0);
+ const GLfloat dstHeightF = (GLfloat) dstHeight;
+
+ const GLint srcXpos = MIN2(srcX0, srcX1);
+ const GLint srcYpos = MIN2(srcY0, srcY1);
+ const GLint dstXpos = MIN2(dstX0, dstX1);
+ const GLint dstYpos = MIN2(dstY0, dstY1);
+
+ const GLboolean invertX = (srcX1 < srcX0) ^ (dstX1 < dstX0);
+ const GLboolean invertY = (srcY1 < srcY0) ^ (dstY1 < dstY0);
+
+ GLint dstRow;
+
+ GLint pixelSize;
+ GLvoid *srcBuffer0, *srcBuffer1;
+ GLint srcBufferY0 = -1, srcBufferY1 = -1;
+ GLvoid *dstBuffer;
+
+ switch (readRb->DataType) {
+ case GL_UNSIGNED_BYTE:
+ pixelSize = 4 * sizeof(GLubyte);
+ break;
+ case GL_UNSIGNED_SHORT:
+ pixelSize = 4 * sizeof(GLushort);
+ break;
+ case GL_UNSIGNED_INT:
+ pixelSize = 4 * sizeof(GLuint);
+ break;
+ case GL_FLOAT:
+ pixelSize = 4 * sizeof(GLfloat);
+ break;
+ default:
+ _mesa_problem(ctx, "unexpected buffer type (0x%x) in blit_nearest",
+ readRb->DataType);
+ return;
+ }
+
+ /* Allocate the src/dst row buffers.
+ * Keep two adjacent src rows around for bilinear sampling.
+ */
+ srcBuffer0 = malloc(pixelSize * srcWidth);
+ if (!srcBuffer0) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
+ return;
+ }
+ srcBuffer1 = malloc(pixelSize * srcWidth);
+ if (!srcBuffer1) {
+ free(srcBuffer0);
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
+ return;
+ }
+ dstBuffer = malloc(pixelSize * dstWidth);
+ if (!dstBuffer) {
+ free(srcBuffer0);
+ free(srcBuffer1);
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
+ return;
+ }
+
+ for (dstRow = 0; dstRow < dstHeight; dstRow++) {
+ const GLint dstY = dstYpos + dstRow;
+ const GLfloat srcRow = (dstRow * srcHeight) / dstHeightF;
+ GLint srcRow0 = IFLOOR(srcRow);
+ GLint srcRow1 = srcRow0 + 1;
+ GLfloat rowWeight = srcRow - srcRow0; /* fractional part of srcRow */
+
+ ASSERT(srcRow >= 0);
+ ASSERT(srcRow < srcHeight);
+
+ if (srcRow1 == srcHeight) {
+ /* last row fudge */
+ srcRow1 = srcRow0;
+ rowWeight = 0.0;
+ }
+
+ if (invertY) {
+ srcRow0 = srcHeight - 1 - srcRow0;
+ srcRow1 = srcHeight - 1 - srcRow1;
+ }
+
+ srcY0 = srcYpos + srcRow0;
+ srcY1 = srcYpos + srcRow1;
+
+ /* get the two source rows */
+ if (srcY0 == srcBufferY0 && srcY1 == srcBufferY1) {
+ /* use same source row buffers again */
+ }
+ else if (srcY0 == srcBufferY1) {
+ /* move buffer1 into buffer0 by swapping pointers */
+ GLvoid *tmp = srcBuffer0;
+ srcBuffer0 = srcBuffer1;
+ srcBuffer1 = tmp;
+ /* get y1 row */
+ readRb->GetRow(ctx, readRb, srcWidth, srcXpos, srcY1, srcBuffer1);
+ srcBufferY0 = srcY0;
+ srcBufferY1 = srcY1;
+ }
+ else {
+ /* get both new rows */
+ readRb->GetRow(ctx, readRb, srcWidth, srcXpos, srcY0, srcBuffer0);
+ readRb->GetRow(ctx, readRb, srcWidth, srcXpos, srcY1, srcBuffer1);
+ srcBufferY0 = srcY0;
+ srcBufferY1 = srcY1;
+ }
+
+ if (readRb->DataType == GL_UNSIGNED_BYTE) {
+ resample_linear_row_ub(srcWidth, dstWidth, srcBuffer0, srcBuffer1,
+ dstBuffer, invertX, rowWeight);
+ }
+ else {
+ _mesa_problem(ctx, "Unsupported color channel type in sw blit");
+ break;
+ }
+
+ /* store pixel row in destination */
+ drawRb->PutRow(ctx, drawRb, dstWidth, dstXpos, dstY, dstBuffer, NULL);
+ }
+
+ free(srcBuffer0);
+ free(srcBuffer1);
+ free(dstBuffer);
+}
+
+
+/**
+ * Simple case: Blit color, depth or stencil with no scaling or flipping.
+ * XXX we could easily support vertical flipping here.
+ */
+static void
+simple_blit(struct gl_context *ctx,
+ GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
+ GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
+ GLbitfield buffer)
+{
+ struct gl_renderbuffer *readRb, *drawRb;
+ const GLint width = srcX1 - srcX0;
+ const GLint height = srcY1 - srcY0;
+ GLint row, srcY, dstY, yStep;
+ GLint comps, bytesPerRow;
+ void *rowBuffer;
+
+ /* only one buffer */
+ ASSERT(_mesa_bitcount(buffer) == 1);
+ /* no flipping checks */
+ ASSERT(srcX0 < srcX1);
+ ASSERT(srcY0 < srcY1);
+ ASSERT(dstX0 < dstX1);
+ ASSERT(dstY0 < dstY1);
+ /* size checks */
+ ASSERT(srcX1 - srcX0 == dstX1 - dstX0);
+ ASSERT(srcY1 - srcY0 == dstY1 - dstY0);
+
+ /* determine if copy should be bottom-to-top or top-to-bottom */
+ if (srcY0 > dstY0) {
+ /* src above dst: copy bottom-to-top */
+ yStep = 1;
+ srcY = srcY0;
+ dstY = dstY0;
+ }
+ else {
+ /* src below dst: copy top-to-bottom */
+ yStep = -1;
+ srcY = srcY1 - 1;
+ dstY = dstY1 - 1;
+ }
+
+ switch (buffer) {
+ case GL_COLOR_BUFFER_BIT:
+ readRb = ctx->ReadBuffer->_ColorReadBuffer;
+ drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0];
+ comps = 4;
+ break;
+ case GL_DEPTH_BUFFER_BIT:
+ readRb = ctx->ReadBuffer->_DepthBuffer;
+ drawRb = ctx->DrawBuffer->_DepthBuffer;
+ comps = 1;
+ break;
+ case GL_STENCIL_BUFFER_BIT:
+ readRb = ctx->ReadBuffer->_StencilBuffer;
+ drawRb = ctx->DrawBuffer->_StencilBuffer;
+ comps = 1;
+ break;
+ default:
+ _mesa_problem(ctx, "unexpected buffer in simple_blit()");
+ return;
+ }
+
+ ASSERT(readRb->DataType == drawRb->DataType);
+
+ /* compute bytes per row */
+ switch (readRb->DataType) {
+ case GL_UNSIGNED_BYTE:
+ bytesPerRow = comps * width * sizeof(GLubyte);
+ break;
+ case GL_UNSIGNED_SHORT:
+ bytesPerRow = comps * width * sizeof(GLushort);
+ break;
+ case GL_UNSIGNED_INT:
+ bytesPerRow = comps * width * sizeof(GLuint);
+ break;
+ case GL_FLOAT:
+ bytesPerRow = comps * width * sizeof(GLfloat);
+ break;
+ default:
+ _mesa_problem(ctx, "unexpected buffer type in simple_blit");
+ return;
+ }
+
+ /* allocate the row buffer */
+ rowBuffer = malloc(bytesPerRow);
+ if (!rowBuffer) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
+ return;
+ }
+
+ for (row = 0; row < height; row++) {
+ readRb->GetRow(ctx, readRb, width, srcX0, srcY, rowBuffer);
+ drawRb->PutRow(ctx, drawRb, width, dstX0, dstY, rowBuffer, NULL);
+ srcY += yStep;
+ dstY += yStep;
+ }
+
+ free(rowBuffer);
+}
+
+
+/**
+ * Software fallback for glBlitFramebufferEXT().
+ */
+void
+_swrast_BlitFramebuffer(struct gl_context *ctx,
+ GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
+ GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
+ GLbitfield mask, GLenum filter)
+{
+ static const GLbitfield buffers[3] = {
+ GL_COLOR_BUFFER_BIT,
+ GL_DEPTH_BUFFER_BIT,
+ GL_STENCIL_BUFFER_BIT
+ };
+ GLint i;
+
+ if (!ctx->DrawBuffer->_NumColorDrawBuffers)
+ return;
+
+ if (!_mesa_clip_blit(ctx, &srcX0, &srcY0, &srcX1, &srcY1,
+ &dstX0, &dstY0, &dstX1, &dstY1)) {
+ return;
+ }
+
+ swrast_render_start(ctx);
+
+ if (srcX1 - srcX0 == dstX1 - dstX0 &&
+ srcY1 - srcY0 == dstY1 - dstY0 &&
+ srcX0 < srcX1 &&
+ srcY0 < srcY1 &&
+ dstX0 < dstX1 &&
+ dstY0 < dstY1) {
+ /* no stretching or flipping.
+ * filter doesn't matter.
+ */
+ for (i = 0; i < 3; i++) {
+ if (mask & buffers[i]) {
+ simple_blit(ctx, srcX0, srcY0, srcX1, srcY1,
+ dstX0, dstY0, dstX1, dstY1, buffers[i]);
+ }
+ }
+ }
+ else {
+ if (filter == GL_NEAREST) {
+ for (i = 0; i < 3; i++) {
+ if (mask & buffers[i]) {
+ blit_nearest(ctx, srcX0, srcY0, srcX1, srcY1,
+ dstX0, dstY0, dstX1, dstY1, buffers[i]);
+ }
+ }
+ }
+ else {
+ ASSERT(filter == GL_LINEAR);
+ if (mask & GL_COLOR_BUFFER_BIT) { /* depth/stencil not allowed */
+ blit_linear(ctx, srcX0, srcY0, srcX1, srcY1,
+ dstX0, dstY0, dstX1, dstY1);
+ }
+ }
+ }
+
+ swrast_render_finish(ctx);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-07 14:16:34 +0000