diff options
author | Brian Paul <brian.paul@tungstengraphics.com> | 2006-03-02 03:37:18 +0000 |
---|---|---|
committer | Brian Paul <brian.paul@tungstengraphics.com> | 2006-03-02 03:37:18 +0000 |
commit | c241d3b06a5c996cb8415a6ada23288621c1d254 (patch) | |
tree | bcdae36e663b3c5e9ad29029f4f729efd620d5e2 /src/mesa/swrast/s_blit.c | |
parent | 93da673904d4c520d3fbd2210e53777bf1598ac6 (diff) |
implementation of _swrast_BlitFramebuffer()
Diffstat (limited to 'src/mesa/swrast/s_blit.c')
-rw-r--r-- | src/mesa/swrast/s_blit.c | 758 |
1 files changed, 754 insertions, 4 deletions
diff --git a/src/mesa/swrast/s_blit.c b/src/mesa/swrast/s_blit.c index 0d08a4effc..5aec4aad03 100644 --- a/src/mesa/swrast/s_blit.c +++ b/src/mesa/swrast/s_blit.c @@ -28,13 +28,763 @@ #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(GLcontext *ctx, + GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, + GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, + GLenum 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][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 = _mesa_malloc(pixelSize * srcWidth); + if (!srcBuffer) { + _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT"); + return; + } + dstBuffer = _mesa_malloc(pixelSize * dstWidth); + if (!dstBuffer) { + _mesa_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); + } + + _mesa_free(srcBuffer); + _mesa_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(GLcontext *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][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 = _mesa_malloc(pixelSize * srcWidth); + if (!srcBuffer0) { + _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT"); + return; + } + srcBuffer1 = _mesa_malloc(pixelSize * srcWidth); + if (!srcBuffer1) { + _mesa_free(srcBuffer0); + _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT"); + return; + } + dstBuffer = _mesa_malloc(pixelSize * dstWidth); + if (!dstBuffer) { + _mesa_free(srcBuffer0); + _mesa_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); + } + + _mesa_free(srcBuffer0); + _mesa_free(srcBuffer1); + _mesa_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(GLcontext *ctx, + GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, + GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, + GLenum 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][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 = _mesa_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; + } + + _mesa_free(rowBuffer); +} + + +/** + * Clip dst coords against Xmax (or Ymax). + */ +static INLINE void +clip_right_or_top(GLint *srcX0, GLint *srcX1, + GLint *dstX0, GLint *dstX1, + GLint maxValue) +{ + GLfloat t, bias; + + if (*dstX1 > maxValue) { + /* X1 outside right edge */ + ASSERT(*dstX0 < maxValue); /* X0 should be inside right edge */ + t = (GLfloat) (maxValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0); + /* chop off [t, 1] part */ + ASSERT(t >= 0.0 && t <= 1.0); + *dstX1 = maxValue; + bias = (*srcX0 < *srcX1) ? 0.5 : -0.5; + *srcX1 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias); + } + else if (*dstX0 > maxValue) { + /* X0 outside right edge */ + ASSERT(*dstX1 < maxValue); /* X1 should be inside right edge */ + t = (GLfloat) (maxValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1); + /* chop off [t, 1] part */ + ASSERT(t >= 0.0 && t <= 1.0); + *dstX0 = maxValue; + bias = (*srcX0 < *srcX1) ? -0.5 : 0.5; + *srcX0 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias); + } +} + + +/** + * Clip dst coords against Xmin (or Ymin). + */ +static INLINE void +clip_left_or_bottom(GLint *srcX0, GLint *srcX1, + GLint *dstX0, GLint *dstX1, + GLint minValue) +{ + GLfloat t, bias; + + if (*dstX0 < minValue) { + /* X0 outside left edge */ + ASSERT(*dstX1 > minValue); /* X1 should be inside left edge */ + t = (GLfloat) (minValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0); + /* chop off [0, t] part */ + ASSERT(t >= 0.0 && t <= 1.0); + *dstX0 = minValue; + bias = (*srcX0 < *srcX1) ? 0.5 : -0.5; /* flipped??? */ + *srcX0 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias); + } + else if (*dstX1 < minValue) { + /* X1 outside left edge */ + ASSERT(*dstX0 > minValue); /* X0 should be inside left edge */ + t = (GLfloat) (minValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1); + /* chop off [0, t] part */ + ASSERT(t >= 0.0 && t <= 1.0); + *dstX1 = minValue; + bias = (*srcX0 < *srcX1) ? 0.5 : -0.5; + *srcX1 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias); + } +} + + +/** + * Do clipping of blit src/dest rectangles. + * The dest rect is clipped against both the buffer bounds and scissor bounds. + * The src rect is just clipped against the buffer bounds. + * + * When either the src or dest rect is clipped, the other is also clipped + * proportionately! + * + * Note that X0 need not be less than X1 (same for Y) for either the source + * and dest rects. That makes the clipping a little trickier. + * + * \return GL_TRUE if anything is left to draw, GL_FALSE if totally clipped + */ +static GLboolean +clip_blit(GLcontext *ctx, + GLint *srcX0, GLint *srcY0, GLint *srcX1, GLint *srcY1, + GLint *dstX0, GLint *dstY0, GLint *dstX1, GLint *dstY1) +{ + const GLint srcXmin = 0; + const GLint srcXmax = ctx->ReadBuffer->Width; + const GLint srcYmin = 0; + const GLint srcYmax = ctx->ReadBuffer->Height; + + /* these include scissor bounds */ + const GLint dstXmin = ctx->DrawBuffer->_Xmin; + const GLint dstXmax = ctx->DrawBuffer->_Xmax; + const GLint dstYmin = ctx->DrawBuffer->_Ymin; + const GLint dstYmax = ctx->DrawBuffer->_Ymax; + + /* + printf("PreClipX: src: %d .. %d dst: %d .. %d\n", + *srcX0, *srcX1, *dstX0, *dstX1); + printf("PreClipY: src: %d .. %d dst: %d .. %d\n", + *srcY0, *srcY1, *dstY0, *dstY1); + */ + + /* trivial rejection tests */ + if (*dstX0 == *dstX1) + return GL_FALSE; /* no width */ + if (*dstX0 <= dstXmin && *dstX1 <= dstXmin) + return GL_FALSE; /* totally out (left) of bounds */ + if (*dstX0 >= dstXmax && *dstX1 >= dstXmax) + return GL_FALSE; /* totally out (right) of bounds */ + + if (*dstY0 == *dstY1) + return GL_FALSE; + if (*dstY0 <= dstYmin && *dstY1 <= dstYmin) + return GL_FALSE; + if (*dstY0 >= dstYmax && *dstY1 >= dstYmax) + return GL_FALSE; + + if (*srcX0 == *srcX1) + return GL_FALSE; + if (*srcX0 <= srcXmin && *srcX1 <= srcXmin) + return GL_FALSE; + if (*srcX0 >= srcXmax && *srcX1 >= srcXmax) + return GL_FALSE; + + if (*srcY0 == *srcY1) + return GL_FALSE; + if (*srcY0 <= srcYmin && *srcY1 <= srcYmin) + return GL_FALSE; + if (*srcY0 >= srcYmax && *srcY1 >= srcYmax) + return GL_FALSE; + + /* + * dest clip + */ + clip_right_or_top(srcX0, srcX1, dstX0, dstX1, dstXmax); + clip_right_or_top(srcY0, srcY1, dstY0, dstY1, dstYmax); + clip_left_or_bottom(srcX0, srcX1, dstX0, dstX1, dstXmin); + clip_left_or_bottom(srcY0, srcY1, dstY0, dstY1, dstYmin); + + /* + * src clip (just swap src/dst values from above) + */ + clip_right_or_top(dstX0, dstX1, srcX0, srcX1, srcXmax); + clip_right_or_top(dstY0, dstY1, srcY0, srcY1, srcYmax); + clip_left_or_bottom(dstX0, dstX1, srcX0, srcX1, srcXmin); + clip_left_or_bottom(dstY0, dstY1, srcY0, srcY1, srcYmin); + + /* + printf("PostClipX: src: %d .. %d dst: %d .. %d\n", + *srcX0, *srcX1, *dstX0, *dstX1); + printf("PostClipY: src: %d .. %d dst: %d .. %d\n", + *srcY0, *srcY1, *dstY0, *dstY1); + */ + + ASSERT(*dstX0 >= dstXmin); + ASSERT(*dstX0 <= dstXmax); + ASSERT(*dstX1 >= dstXmin); + ASSERT(*dstX1 <= dstXmax); + + ASSERT(*dstY0 >= dstYmin); + ASSERT(*dstY0 <= dstYmax); + ASSERT(*dstY1 >= dstYmin); + ASSERT(*dstY1 <= dstYmax); + + ASSERT(*srcX0 >= srcXmin); + ASSERT(*srcX0 <= srcXmax); + ASSERT(*srcX1 >= srcXmin); + ASSERT(*srcX1 <= srcXmax); + + ASSERT(*srcY0 >= srcYmin); + ASSERT(*srcY0 <= srcYmax); + ASSERT(*srcY1 >= srcYmin); + ASSERT(*srcY1 <= srcYmax); + + return GL_TRUE; +} + + /** * Software fallback for glBlitFramebufferEXT(). */ void -_swrast_blit_framebuffer(GLcontext *ctx, - GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, - GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, - GLbitfield mask, GLenum filter) +_swrast_BlitFramebuffer(GLcontext *ctx, + GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, + GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, + GLbitfield mask, GLenum filter) { + SWcontext *swrast = SWRAST_CONTEXT(ctx); + static const GLint buffers[3] = { + GL_COLOR_BUFFER_BIT, + GL_DEPTH_BUFFER_BIT, + GL_STENCIL_BUFFER_BIT + }; + GLint i; + + if (!clip_blit(ctx, &srcX0, &srcY0, &srcX1, &srcY1, + &dstX0, &dstY0, &dstX1, &dstY1)) { + return; + } + + RENDER_START(swrast, 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); + } + } + } + + RENDER_FINISH(swrast, ctx); } |