void _swrast_CopyConvolutionFilter1D(GLcontext *ctx, GLenum target, GLenum internalFormat, GLint x, GLint y, GLsizei width) { SWcontext *swrast = SWRAST_CONTEXT(ctx); GLchan rgba[MAX_CONVOLUTION_WIDTH][4]; /* Select buffer to read from */ _swrast_use_read_buffer(ctx); RENDER_START( swrast, ctx ); /* read the data from framebuffer */ _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, (GLchan (*)[4]) rgba ); RENDER_FINISH( swrast, ctx ); /* Restore reading from draw buffer (the default) */ _swrast_use_draw_buffer(ctx); /* store as convolution filter */ glConvolutionFilter1D(target, internalFormat, width, GL_RGBA, CHAN_TYPE, rgba); }
void _swrast_CopyConvolutionFilter2D(GLcontext *ctx, GLenum target, GLenum internalFormat, GLint x, GLint y, GLsizei width, GLsizei height) { SWcontext *swrast = SWRAST_CONTEXT(ctx); struct gl_pixelstore_attrib packSave; GLchan rgba[MAX_CONVOLUTION_HEIGHT][MAX_CONVOLUTION_WIDTH][4]; GLint i; /* Select buffer to read from */ _swrast_use_read_buffer(ctx); RENDER_START(swrast,ctx); /* read pixels from framebuffer */ for (i = 0; i < height; i++) { _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y + i, (GLchan (*)[4]) rgba[i] ); } RENDER_FINISH(swrast,ctx); /* Restore reading from draw buffer (the default) */ _swrast_use_draw_buffer(ctx); /* * HACK: save & restore context state so we can store this as a * convolution filter via the GL api. Doesn't call any callbacks * hanging off ctx->Unpack statechanges. */ packSave = ctx->Unpack; /* save pixel packing params */ ctx->Unpack.Alignment = 1; ctx->Unpack.RowLength = MAX_CONVOLUTION_WIDTH; ctx->Unpack.SkipPixels = 0; ctx->Unpack.SkipRows = 0; ctx->Unpack.ImageHeight = 0; ctx->Unpack.SkipImages = 0; ctx->Unpack.SwapBytes = GL_FALSE; ctx->Unpack.LsbFirst = GL_FALSE; ctx->NewState |= _NEW_PACKUNPACK; glConvolutionFilter2D(target, internalFormat, width, height, GL_RGBA, CHAN_TYPE, rgba); ctx->Unpack = packSave; /* restore pixel packing params */ ctx->NewState |= _NEW_PACKUNPACK; }
void _swrast_CopyColorSubTable( GLcontext *ctx,GLenum target, GLsizei start, GLint x, GLint y, GLsizei width) { GLchan data[MAX_WIDTH][4]; /* Select buffer to read from */ _swrast_use_read_buffer(ctx); if (width > MAX_WIDTH) width = MAX_WIDTH; /* read the data from framebuffer */ _mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y, data ); /* Restore reading from draw buffer (the default) */ _swrast_use_draw_buffer(ctx); glColorSubTable(target, start, width, GL_RGBA, CHAN_TYPE, data); }
/* * Clear the front/back/left/right color buffers. * This function is usually only called if we need to clear the * buffers with masking. */ static void clear_color_buffers(GLcontext *ctx) { SWcontext *swrast = SWRAST_CONTEXT(ctx); const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask); GLuint bufferBit; /* loop over four possible dest color buffers */ for (bufferBit = 1; bufferBit <= 8; bufferBit = bufferBit << 1) { if (bufferBit & ctx->Color._DrawDestMask) { (*swrast->Driver.SetBuffer)(ctx, ctx->DrawBuffer, bufferBit); if (colorMask != 0xffffffff) { clear_color_buffer_with_masking(ctx); } else { clear_color_buffer(ctx); } } } /* restore default read/draw buffer */ _swrast_use_draw_buffer(ctx); }
/* * Fallback for ctx->Driver.DrawBuffer() */ void _swrast_DrawBuffer( GLcontext *ctx, GLenum mode ) { _swrast_use_draw_buffer(ctx); }