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Diffstat (limited to 'mesalib/src/mesa/swrast/s_drawpix.c')
-rw-r--r--mesalib/src/mesa/swrast/s_drawpix.c898
1 files changed, 898 insertions, 0 deletions
diff --git a/mesalib/src/mesa/swrast/s_drawpix.c b/mesalib/src/mesa/swrast/s_drawpix.c
new file mode 100644
index 000000000..6970b2e9c
--- /dev/null
+++ b/mesalib/src/mesa/swrast/s_drawpix.c
@@ -0,0 +1,898 @@
+/*
+ * Mesa 3-D graphics library
+ * Version: 7.1
+ *
+ * Copyright (C) 1999-2007 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/bufferobj.h"
+#include "main/context.h"
+#include "main/convolve.h"
+#include "main/image.h"
+#include "main/macros.h"
+#include "main/imports.h"
+#include "main/pixel.h"
+#include "main/state.h"
+
+#include "s_context.h"
+#include "s_span.h"
+#include "s_stencil.h"
+#include "s_zoom.h"
+
+
+
+/**
+ * Try to do a fast and simple RGB(a) glDrawPixels.
+ * Return: GL_TRUE if success, GL_FALSE if slow path must be used instead
+ */
+static GLboolean
+fast_draw_rgba_pixels(GLcontext *ctx, GLint x, GLint y,
+ GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ const struct gl_pixelstore_attrib *userUnpack,
+ const GLvoid *pixels)
+{
+ const GLint imgX = x, imgY = y;
+ struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
+ GLenum rbType;
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ SWspan span;
+ GLboolean simpleZoom;
+ GLint yStep; /* +1 or -1 */
+ struct gl_pixelstore_attrib unpack;
+ GLint destX, destY, drawWidth, drawHeight; /* post clipping */
+
+ if (!rb)
+ return GL_TRUE; /* no-op */
+
+ rbType = rb->DataType;
+
+ if ((swrast->_RasterMask & ~CLIP_BIT) ||
+ ctx->Texture._EnabledCoordUnits ||
+ userUnpack->SwapBytes ||
+ ctx->_ImageTransferState) {
+ /* can't handle any of those conditions */
+ return GL_FALSE;
+ }
+
+ INIT_SPAN(span, GL_BITMAP);
+ span.arrayMask = SPAN_RGBA;
+ span.arrayAttribs = FRAG_BIT_COL0;
+ _swrast_span_default_attribs(ctx, &span);
+
+ /* copy input params since clipping may change them */
+ unpack = *userUnpack;
+ destX = x;
+ destY = y;
+ drawWidth = width;
+ drawHeight = height;
+
+ /* check for simple zooming and clipping */
+ if (ctx->Pixel.ZoomX == 1.0F &&
+ (ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F)) {
+ if (!_mesa_clip_drawpixels(ctx, &destX, &destY,
+ &drawWidth, &drawHeight, &unpack)) {
+ /* image was completely clipped: no-op, all done */
+ return GL_TRUE;
+ }
+ simpleZoom = GL_TRUE;
+ yStep = (GLint) ctx->Pixel.ZoomY;
+ ASSERT(yStep == 1 || yStep == -1);
+ }
+ else {
+ /* non-simple zooming */
+ simpleZoom = GL_FALSE;
+ yStep = 1;
+ if (unpack.RowLength == 0)
+ unpack.RowLength = width;
+ }
+
+ /*
+ * Ready to draw!
+ */
+
+ if (format == GL_RGBA && type == rbType) {
+ const GLubyte *src
+ = (const GLubyte *) _mesa_image_address2d(&unpack, pixels, width,
+ height, format, type, 0, 0);
+ const GLint srcStride = _mesa_image_row_stride(&unpack, width,
+ format, type);
+ if (simpleZoom) {
+ GLint row;
+ for (row = 0; row < drawHeight; row++) {
+ rb->PutRow(ctx, rb, drawWidth, destX, destY, src, NULL);
+ src += srcStride;
+ destY += yStep;
+ }
+ }
+ else {
+ /* with zooming */
+ GLint row;
+ for (row = 0; row < drawHeight; row++) {
+ span.x = destX;
+ span.y = destY + row;
+ span.end = drawWidth;
+ span.array->ChanType = rbType;
+ _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span, src);
+ src += srcStride;
+ }
+ span.array->ChanType = CHAN_TYPE;
+ }
+ return GL_TRUE;
+ }
+
+ if (format == GL_RGB && type == rbType) {
+ const GLubyte *src
+ = (const GLubyte *) _mesa_image_address2d(&unpack, pixels, width,
+ height, format, type, 0, 0);
+ const GLint srcStride = _mesa_image_row_stride(&unpack, width,
+ format, type);
+ if (simpleZoom) {
+ GLint row;
+ for (row = 0; row < drawHeight; row++) {
+ rb->PutRowRGB(ctx, rb, drawWidth, destX, destY, src, NULL);
+ src += srcStride;
+ destY += yStep;
+ }
+ }
+ else {
+ /* with zooming */
+ GLint row;
+ for (row = 0; row < drawHeight; row++) {
+ span.x = destX;
+ span.y = destY;
+ span.end = drawWidth;
+ span.array->ChanType = rbType;
+ _swrast_write_zoomed_rgb_span(ctx, imgX, imgY, &span, src);
+ src += srcStride;
+ destY++;
+ }
+ span.array->ChanType = CHAN_TYPE;
+ }
+ return GL_TRUE;
+ }
+
+ /* Remaining cases haven't been tested with alignment != 1 */
+ if (userUnpack->Alignment != 1)
+ return GL_FALSE;
+
+ if (format == GL_LUMINANCE && type == CHAN_TYPE && rbType == CHAN_TYPE) {
+ const GLchan *src = (const GLchan *) pixels
+ + (unpack.SkipRows * unpack.RowLength + unpack.SkipPixels);
+ if (simpleZoom) {
+ /* no zooming */
+ GLint row;
+ ASSERT(drawWidth <= MAX_WIDTH);
+ for (row = 0; row < drawHeight; row++) {
+ GLchan rgb[MAX_WIDTH][3];
+ GLint i;
+ for (i = 0;i<drawWidth;i++) {
+ rgb[i][0] = src[i];
+ rgb[i][1] = src[i];
+ rgb[i][2] = src[i];
+ }
+ rb->PutRowRGB(ctx, rb, drawWidth, destX, destY, rgb, NULL);
+ src += unpack.RowLength;
+ destY += yStep;
+ }
+ }
+ else {
+ /* with zooming */
+ GLint row;
+ ASSERT(drawWidth <= MAX_WIDTH);
+ for (row = 0; row < drawHeight; row++) {
+ GLchan rgb[MAX_WIDTH][3];
+ GLint i;
+ for (i = 0;i<drawWidth;i++) {
+ rgb[i][0] = src[i];
+ rgb[i][1] = src[i];
+ rgb[i][2] = src[i];
+ }
+ span.x = destX;
+ span.y = destY;
+ span.end = drawWidth;
+ _swrast_write_zoomed_rgb_span(ctx, imgX, imgY, &span, rgb);
+ src += unpack.RowLength;
+ destY++;
+ }
+ }
+ return GL_TRUE;
+ }
+
+ if (format == GL_LUMINANCE_ALPHA && type == CHAN_TYPE && rbType == CHAN_TYPE) {
+ const GLchan *src = (const GLchan *) pixels
+ + (unpack.SkipRows * unpack.RowLength + unpack.SkipPixels)*2;
+ if (simpleZoom) {
+ GLint row;
+ ASSERT(drawWidth <= MAX_WIDTH);
+ for (row = 0; row < drawHeight; row++) {
+ GLint i;
+ const GLchan *ptr = src;
+ for (i = 0;i<drawWidth;i++) {
+ span.array->rgba[i][0] = *ptr;
+ span.array->rgba[i][1] = *ptr;
+ span.array->rgba[i][2] = *ptr++;
+ span.array->rgba[i][3] = *ptr++;
+ }
+ rb->PutRow(ctx, rb, drawWidth, destX, destY,
+ span.array->rgba, NULL);
+ src += unpack.RowLength*2;
+ destY += yStep;
+ }
+ }
+ else {
+ /* with zooming */
+ GLint row;
+ ASSERT(drawWidth <= MAX_WIDTH);
+ for (row = 0; row < drawHeight; row++) {
+ const GLchan *ptr = src;
+ GLint i;
+ for (i = 0;i<drawWidth;i++) {
+ span.array->rgba[i][0] = *ptr;
+ span.array->rgba[i][1] = *ptr;
+ span.array->rgba[i][2] = *ptr++;
+ span.array->rgba[i][3] = *ptr++;
+ }
+ span.x = destX;
+ span.y = destY;
+ span.end = drawWidth;
+ _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
+ span.array->rgba);
+ src += unpack.RowLength*2;
+ destY++;
+ }
+ }
+ return GL_TRUE;
+ }
+
+ if (format == GL_COLOR_INDEX && type == GL_UNSIGNED_BYTE) {
+ const GLubyte *src = (const GLubyte *) pixels
+ + unpack.SkipRows * unpack.RowLength + unpack.SkipPixels;
+ if (ctx->Visual.rgbMode && rbType == GL_UNSIGNED_BYTE) {
+ /* convert ubyte/CI data to ubyte/RGBA */
+ if (simpleZoom) {
+ GLint row;
+ for (row = 0; row < drawHeight; row++) {
+ ASSERT(drawWidth <= MAX_WIDTH);
+ _mesa_map_ci8_to_rgba8(ctx, drawWidth, src,
+ span.array->rgba8);
+ rb->PutRow(ctx, rb, drawWidth, destX, destY,
+ span.array->rgba8, NULL);
+ src += unpack.RowLength;
+ destY += yStep;
+ }
+ }
+ else {
+ /* ubyte/CI to ubyte/RGBA with zooming */
+ GLint row;
+ for (row = 0; row < drawHeight; row++) {
+ ASSERT(drawWidth <= MAX_WIDTH);
+ _mesa_map_ci8_to_rgba8(ctx, drawWidth, src,
+ span.array->rgba8);
+ span.x = destX;
+ span.y = destY;
+ span.end = drawWidth;
+ _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
+ span.array->rgba8);
+ src += unpack.RowLength;
+ destY++;
+ }
+ }
+ return GL_TRUE;
+ }
+ else if (!ctx->Visual.rgbMode && rbType == GL_UNSIGNED_INT) {
+ /* write CI data to CI frame buffer */
+ GLint row;
+ if (simpleZoom) {
+ for (row = 0; row < drawHeight; row++) {
+ GLuint index32[MAX_WIDTH];
+ GLint col;
+ for (col = 0; col < drawWidth; col++)
+ index32[col] = src[col];
+ rb->PutRow(ctx, rb, drawWidth, destX, destY, index32, NULL);
+ src += unpack.RowLength;
+ destY += yStep;
+ }
+ return GL_TRUE;
+ }
+ }
+ }
+
+ /* can't handle this pixel format and/or data type */
+ return GL_FALSE;
+}
+
+
+
+/*
+ * Draw color index image.
+ */
+static void
+draw_index_pixels( GLcontext *ctx, GLint x, GLint y,
+ GLsizei width, GLsizei height,
+ GLenum type,
+ const struct gl_pixelstore_attrib *unpack,
+ const GLvoid *pixels )
+{
+ const GLint imgX = x, imgY = y;
+ const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
+ GLint row, skipPixels;
+ SWspan span;
+
+ INIT_SPAN(span, GL_BITMAP);
+ span.arrayMask = SPAN_INDEX;
+ _swrast_span_default_attribs(ctx, &span);
+
+ /*
+ * General solution
+ */
+ skipPixels = 0;
+ while (skipPixels < width) {
+ const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
+ ASSERT(spanWidth <= MAX_WIDTH);
+ for (row = 0; row < height; row++) {
+ const GLvoid *source = _mesa_image_address2d(unpack, pixels,
+ width, height,
+ GL_COLOR_INDEX, type,
+ row, skipPixels);
+ _mesa_unpack_index_span(ctx, spanWidth, GL_UNSIGNED_INT,
+ span.array->index, type, source, unpack,
+ ctx->_ImageTransferState);
+
+ /* These may get changed during writing/clipping */
+ span.x = x + skipPixels;
+ span.y = y + row;
+ span.end = spanWidth;
+
+ if (zoom)
+ _swrast_write_zoomed_index_span(ctx, imgX, imgY, &span);
+ else
+ _swrast_write_index_span(ctx, &span);
+ }
+ skipPixels += spanWidth;
+ }
+}
+
+
+
+/*
+ * Draw stencil image.
+ */
+static void
+draw_stencil_pixels( GLcontext *ctx, GLint x, GLint y,
+ GLsizei width, GLsizei height,
+ GLenum type,
+ const struct gl_pixelstore_attrib *unpack,
+ const GLvoid *pixels )
+{
+ const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
+ GLint skipPixels;
+
+ /* if width > MAX_WIDTH, have to process image in chunks */
+ skipPixels = 0;
+ while (skipPixels < width) {
+ const GLint spanX = x + skipPixels;
+ const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
+ GLint row;
+ for (row = 0; row < height; row++) {
+ const GLint spanY = y + row;
+ GLstencil values[MAX_WIDTH];
+ GLenum destType = (sizeof(GLstencil) == sizeof(GLubyte))
+ ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
+ const GLvoid *source = _mesa_image_address2d(unpack, pixels,
+ width, height,
+ GL_COLOR_INDEX, type,
+ row, skipPixels);
+ _mesa_unpack_stencil_span(ctx, spanWidth, destType, values,
+ type, source, unpack,
+ ctx->_ImageTransferState);
+ if (zoom) {
+ _swrast_write_zoomed_stencil_span(ctx, x, y, spanWidth,
+ spanX, spanY, values);
+ }
+ else {
+ _swrast_write_stencil_span(ctx, spanWidth, spanX, spanY, values);
+ }
+ }
+ skipPixels += spanWidth;
+ }
+}
+
+
+/*
+ * Draw depth image.
+ */
+static void
+draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
+ GLsizei width, GLsizei height,
+ GLenum type,
+ const struct gl_pixelstore_attrib *unpack,
+ const GLvoid *pixels )
+{
+ const GLboolean scaleOrBias
+ = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
+ const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
+ SWspan span;
+
+ INIT_SPAN(span, GL_BITMAP);
+ span.arrayMask = SPAN_Z;
+ _swrast_span_default_attribs(ctx, &span);
+
+ if (type == GL_UNSIGNED_SHORT
+ && ctx->DrawBuffer->Visual.depthBits == 16
+ && !scaleOrBias
+ && !zoom
+ && ctx->Visual.rgbMode
+ && width <= MAX_WIDTH
+ && !unpack->SwapBytes) {
+ /* Special case: directly write 16-bit depth values */
+ GLint row;
+ for (row = 0; row < height; row++) {
+ const GLushort *zSrc = (const GLushort *)
+ _mesa_image_address2d(unpack, pixels, width, height,
+ GL_DEPTH_COMPONENT, type, row, 0);
+ GLint i;
+ for (i = 0; i < width; i++)
+ span.array->z[i] = zSrc[i];
+ span.x = x;
+ span.y = y + row;
+ span.end = width;
+ _swrast_write_rgba_span(ctx, &span);
+ }
+ }
+ else if (type == GL_UNSIGNED_INT
+ && !scaleOrBias
+ && !zoom
+ && ctx->Visual.rgbMode
+ && width <= MAX_WIDTH
+ && !unpack->SwapBytes) {
+ /* Special case: shift 32-bit values down to Visual.depthBits */
+ const GLint shift = 32 - ctx->DrawBuffer->Visual.depthBits;
+ GLint row;
+ for (row = 0; row < height; row++) {
+ const GLuint *zSrc = (const GLuint *)
+ _mesa_image_address2d(unpack, pixels, width, height,
+ GL_DEPTH_COMPONENT, type, row, 0);
+ if (shift == 0) {
+ _mesa_memcpy(span.array->z, zSrc, width * sizeof(GLuint));
+ }
+ else {
+ GLint col;
+ for (col = 0; col < width; col++)
+ span.array->z[col] = zSrc[col] >> shift;
+ }
+ span.x = x;
+ span.y = y + row;
+ span.end = width;
+ _swrast_write_rgba_span(ctx, &span);
+ }
+ }
+ else {
+ /* General case */
+ const GLuint depthMax = ctx->DrawBuffer->_DepthMax;
+ GLint skipPixels = 0;
+
+ /* in case width > MAX_WIDTH do the copy in chunks */
+ while (skipPixels < width) {
+ const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
+ GLint row;
+ ASSERT(span.end <= MAX_WIDTH);
+ for (row = 0; row < height; row++) {
+ const GLvoid *zSrc = _mesa_image_address2d(unpack,
+ pixels, width, height,
+ GL_DEPTH_COMPONENT, type,
+ row, skipPixels);
+
+ /* Set these for each row since the _swrast_write_* function may
+ * change them while clipping.
+ */
+ span.x = x + skipPixels;
+ span.y = y + row;
+ span.end = spanWidth;
+
+ _mesa_unpack_depth_span(ctx, spanWidth,
+ GL_UNSIGNED_INT, span.array->z, depthMax,
+ type, zSrc, unpack);
+ if (zoom) {
+ _swrast_write_zoomed_depth_span(ctx, x, y, &span);
+ }
+ else if (ctx->Visual.rgbMode) {
+ _swrast_write_rgba_span(ctx, &span);
+ }
+ else {
+ _swrast_write_index_span(ctx, &span);
+ }
+ }
+ skipPixels += spanWidth;
+ }
+ }
+}
+
+
+
+/**
+ * Draw RGBA image.
+ */
+static void
+draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y,
+ GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ const struct gl_pixelstore_attrib *unpack,
+ const GLvoid *pixels )
+{
+ const GLint imgX = x, imgY = y;
+ const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
+ GLfloat *convImage = NULL;
+ GLbitfield transferOps = ctx->_ImageTransferState;
+ SWspan span;
+
+ /* Try an optimized glDrawPixels first */
+ if (fast_draw_rgba_pixels(ctx, x, y, width, height, format, type,
+ unpack, pixels)) {
+ return;
+ }
+
+ INIT_SPAN(span, GL_BITMAP);
+ _swrast_span_default_attribs(ctx, &span);
+ span.arrayMask = SPAN_RGBA;
+ span.arrayAttribs = FRAG_BIT_COL0; /* we're fill in COL0 attrib values */
+
+ if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
+ /* Convolution has to be handled specially. We'll create an
+ * intermediate image, applying all pixel transfer operations
+ * up to convolution. Then we'll convolve the image. Then
+ * we'll proceed with the rest of the transfer operations and
+ * rasterize the image.
+ */
+ GLint row;
+ GLfloat *dest, *tmpImage;
+
+ tmpImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
+ if (!tmpImage) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
+ return;
+ }
+ convImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
+ if (!convImage) {
+ _mesa_free(tmpImage);
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
+ return;
+ }
+
+ /* Unpack the image and apply transfer ops up to convolution */
+ dest = tmpImage;
+ for (row = 0; row < height; row++) {
+ const GLvoid *source = _mesa_image_address2d(unpack,
+ pixels, width, height, format, type, row, 0);
+ _mesa_unpack_color_span_float(ctx, width, GL_RGBA, (GLfloat *) dest,
+ format, type, source, unpack,
+ transferOps & IMAGE_PRE_CONVOLUTION_BITS);
+ dest += width * 4;
+ }
+
+ /* do convolution */
+ if (ctx->Pixel.Convolution2DEnabled) {
+ _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
+ }
+ else {
+ ASSERT(ctx->Pixel.Separable2DEnabled);
+ _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
+ }
+ _mesa_free(tmpImage);
+
+ /* continue transfer ops and draw the convolved image */
+ unpack = &ctx->DefaultPacking;
+ pixels = convImage;
+ format = GL_RGBA;
+ type = GL_FLOAT;
+ transferOps &= IMAGE_POST_CONVOLUTION_BITS;
+ }
+ else if (ctx->Pixel.Convolution1DEnabled) {
+ /* we only want to apply 1D convolution to glTexImage1D */
+ transferOps &= ~(IMAGE_CONVOLUTION_BIT |
+ IMAGE_POST_CONVOLUTION_SCALE_BIAS);
+ }
+
+ if (ctx->DrawBuffer->_NumColorDrawBuffers > 0 &&
+ ctx->DrawBuffer->_ColorDrawBuffers[0]->DataType != GL_FLOAT &&
+ ctx->Color.ClampFragmentColor != GL_FALSE) {
+ /* need to clamp colors before applying fragment ops */
+ transferOps |= IMAGE_CLAMP_BIT;
+ }
+
+ /*
+ * General solution
+ */
+ {
+ const GLboolean sink = (ctx->Pixel.MinMaxEnabled && ctx->MinMax.Sink)
+ || (ctx->Pixel.HistogramEnabled && ctx->Histogram.Sink);
+ const GLbitfield interpMask = span.interpMask;
+ const GLbitfield arrayMask = span.arrayMask;
+ const GLint srcStride
+ = _mesa_image_row_stride(unpack, width, format, type);
+ GLint skipPixels = 0;
+ /* use span array for temp color storage */
+ GLfloat *rgba = (GLfloat *) span.array->attribs[FRAG_ATTRIB_COL0];
+
+ /* if the span is wider than MAX_WIDTH we have to do it in chunks */
+ while (skipPixels < width) {
+ const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
+ const GLubyte *source
+ = (const GLubyte *) _mesa_image_address2d(unpack, pixels,
+ width, height, format,
+ type, 0, skipPixels);
+ GLint row;
+
+ for (row = 0; row < height; row++) {
+ /* get image row as float/RGBA */
+ _mesa_unpack_color_span_float(ctx, spanWidth, GL_RGBA, rgba,
+ format, type, source, unpack,
+ transferOps);
+ /* draw the span */
+ if (!sink) {
+ /* Set these for each row since the _swrast_write_* functions
+ * may change them while clipping/rendering.
+ */
+ span.array->ChanType = GL_FLOAT;
+ span.x = x + skipPixels;
+ span.y = y + row;
+ span.end = spanWidth;
+ span.arrayMask = arrayMask;
+ span.interpMask = interpMask;
+ if (zoom) {
+ _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span, rgba);
+ }
+ else {
+ _swrast_write_rgba_span(ctx, &span);
+ }
+ }
+
+ source += srcStride;
+ } /* for row */
+
+ skipPixels += spanWidth;
+ } /* while skipPixels < width */
+
+ /* XXX this is ugly/temporary, to undo above change */
+ span.array->ChanType = CHAN_TYPE;
+ }
+
+ if (convImage) {
+ _mesa_free(convImage);
+ }
+}
+
+
+/**
+ * This is a bit different from drawing GL_DEPTH_COMPONENT pixels.
+ * The only per-pixel operations that apply are depth scale/bias,
+ * stencil offset/shift, GL_DEPTH_WRITEMASK and GL_STENCIL_WRITEMASK,
+ * and pixel zoom.
+ * Also, only the depth buffer and stencil buffers are touched, not the
+ * color buffer(s).
+ */
+static void
+draw_depth_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
+ GLsizei width, GLsizei height, GLenum type,
+ const struct gl_pixelstore_attrib *unpack,
+ const GLvoid *pixels)
+{
+ const GLint imgX = x, imgY = y;
+ const GLboolean scaleOrBias
+ = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
+ const GLuint depthMax = ctx->DrawBuffer->_DepthMax;
+ const GLuint stencilMask = ctx->Stencil.WriteMask[0];
+ const GLuint stencilType = (STENCIL_BITS == 8) ?
+ GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
+ const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
+ struct gl_renderbuffer *depthRb, *stencilRb;
+ struct gl_pixelstore_attrib clippedUnpack = *unpack;
+
+ if (!zoom) {
+ if (!_mesa_clip_drawpixels(ctx, &x, &y, &width, &height,
+ &clippedUnpack)) {
+ /* totally clipped */
+ return;
+ }
+ }
+
+ depthRb = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
+ stencilRb = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
+ ASSERT(depthRb);
+ ASSERT(stencilRb);
+
+ if (depthRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
+ stencilRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
+ depthRb == stencilRb &&
+ !scaleOrBias &&
+ !zoom &&
+ ctx->Depth.Mask &&
+ (stencilMask & 0xff) == 0xff) {
+ /* This is the ideal case.
+ * Drawing GL_DEPTH_STENCIL pixels into a combined depth/stencil buffer.
+ * Plus, no pixel transfer ops, zooming, or masking needed.
+ */
+ GLint i;
+ for (i = 0; i < height; i++) {
+ const GLuint *src = (const GLuint *)
+ _mesa_image_address2d(&clippedUnpack, pixels, width, height,
+ GL_DEPTH_STENCIL_EXT, type, i, 0);
+ depthRb->PutRow(ctx, depthRb, width, x, y + i, src, NULL);
+ }
+ }
+ else {
+ /* sub-optimal cases:
+ * Separate depth/stencil buffers, or pixel transfer ops required.
+ */
+ /* XXX need to handle very wide images (skippixels) */
+ GLint i;
+
+ depthRb = ctx->DrawBuffer->_DepthBuffer;
+ stencilRb = ctx->DrawBuffer->_StencilBuffer;
+
+ for (i = 0; i < height; i++) {
+ const GLuint *depthStencilSrc = (const GLuint *)
+ _mesa_image_address2d(&clippedUnpack, pixels, width, height,
+ GL_DEPTH_STENCIL_EXT, type, i, 0);
+
+ if (ctx->Depth.Mask) {
+ if (!scaleOrBias && ctx->DrawBuffer->Visual.depthBits == 24) {
+ /* fast path 24-bit zbuffer */
+ GLuint zValues[MAX_WIDTH];
+ GLint j;
+ ASSERT(depthRb->DataType == GL_UNSIGNED_INT);
+ for (j = 0; j < width; j++) {
+ zValues[j] = depthStencilSrc[j] >> 8;
+ }
+ if (zoom)
+ _swrast_write_zoomed_z_span(ctx, imgX, imgY, width,
+ x, y + i, zValues);
+ else
+ depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues,NULL);
+ }
+ else if (!scaleOrBias && ctx->DrawBuffer->Visual.depthBits == 16) {
+ /* fast path 16-bit zbuffer */
+ GLushort zValues[MAX_WIDTH];
+ GLint j;
+ ASSERT(depthRb->DataType == GL_UNSIGNED_SHORT);
+ for (j = 0; j < width; j++) {
+ zValues[j] = depthStencilSrc[j] >> 16;
+ }
+ if (zoom)
+ _swrast_write_zoomed_z_span(ctx, imgX, imgY, width,
+ x, y + i, zValues);
+ else
+ depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues,NULL);
+ }
+ else {
+ /* general case */
+ GLuint zValues[MAX_WIDTH]; /* 16 or 32-bit Z value storage */
+ _mesa_unpack_depth_span(ctx, width,
+ depthRb->DataType, zValues, depthMax,
+ type, depthStencilSrc, &clippedUnpack);
+ if (zoom) {
+ _swrast_write_zoomed_z_span(ctx, imgX, imgY, width, x,
+ y + i, zValues);
+ }
+ else {
+ depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues,NULL);
+ }
+ }
+ }
+
+ if (stencilMask != 0x0) {
+ GLstencil stencilValues[MAX_WIDTH];
+ /* get stencil values, with shift/offset/mapping */
+ _mesa_unpack_stencil_span(ctx, width, stencilType, stencilValues,
+ type, depthStencilSrc, &clippedUnpack,
+ ctx->_ImageTransferState);
+ if (zoom)
+ _swrast_write_zoomed_stencil_span(ctx, imgX, imgY, width,
+ x, y + i, stencilValues);
+ else
+ _swrast_write_stencil_span(ctx, width, x, y + i, stencilValues);
+ }
+ }
+ }
+}
+
+
+/**
+ * Execute software-based glDrawPixels.
+ * By time we get here, all error checking will have been done.
+ */
+void
+_swrast_DrawPixels( GLcontext *ctx,
+ GLint x, GLint y,
+ GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ const struct gl_pixelstore_attrib *unpack,
+ const GLvoid *pixels )
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ GLboolean save_vp_override = ctx->VertexProgram._Overriden;
+
+ /* We are creating fragments directly, without going through vertex
+ * programs.
+ *
+ * This override flag tells the fragment processing code that its input
+ * comes from a non-standard source, and it may therefore not rely on
+ * optimizations that assume e.g. constant color if there is no color
+ * vertex array.
+ */
+ _mesa_set_vp_override(ctx, GL_TRUE);
+
+ swrast_render_start(ctx);
+
+ if (ctx->NewState)
+ _mesa_update_state(ctx);
+
+ if (swrast->NewState)
+ _swrast_validate_derived( ctx );
+
+ pixels = _mesa_map_pbo_source(ctx, unpack, pixels);
+ if (!pixels) {
+ swrast_render_finish(ctx);
+ _mesa_set_vp_override(ctx, save_vp_override);
+ return;
+ }
+
+ switch (format) {
+ case GL_STENCIL_INDEX:
+ draw_stencil_pixels( ctx, x, y, width, height, type, unpack, pixels );
+ break;
+ case GL_DEPTH_COMPONENT:
+ draw_depth_pixels( ctx, x, y, width, height, type, unpack, pixels );
+ break;
+ case GL_COLOR_INDEX:
+ if (ctx->Visual.rgbMode)
+ draw_rgba_pixels(ctx, x,y, width, height, format, type, unpack, pixels);
+ else
+ draw_index_pixels(ctx, x, y, width, height, type, unpack, pixels);
+ break;
+ case GL_RED:
+ case GL_GREEN:
+ case GL_BLUE:
+ case GL_ALPHA:
+ case GL_LUMINANCE:
+ case GL_LUMINANCE_ALPHA:
+ case GL_RGB:
+ case GL_BGR:
+ case GL_RGBA:
+ case GL_BGRA:
+ case GL_ABGR_EXT:
+ draw_rgba_pixels(ctx, x, y, width, height, format, type, unpack, pixels);
+ break;
+ case GL_DEPTH_STENCIL_EXT:
+ draw_depth_stencil_pixels(ctx, x, y, width, height,
+ type, unpack, pixels);
+ break;
+ default:
+ _mesa_problem(ctx, "unexpected format in _swrast_DrawPixels");
+ /* don't return yet, clean-up */
+ }
+
+ swrast_render_finish(ctx);
+ _mesa_set_vp_override(ctx, save_vp_override);
+
+ _mesa_unmap_pbo_source(ctx, unpack);
+}