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intel: Fix flipped Y for glDrawPixels(GL_STENCIL_INDEX) to window system.

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Even after fixing bugs in this code, it doesn't make me feel any cleaner.
Fixes piglit stencil-drawpixels.
This commit is contained in:
Eric Anholt
2009-07-07 15:10:21 -07:00
parent bdd7506f10
commit be64e66e5a
1 changed files with 17 additions and 5 deletions
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22
src/mesa/drivers/dri/intel/intel_pixel_draw.c
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@@ -211,8 +211,9 @@ intel_stencil_drawpixels(GLcontext * ctx,
struct gl_renderbuffer *rb;
struct gl_pixelstore_attrib old_unpack;
GLstencil *stencil_pixels;
int row;
int row, y1, y2;
GLint old_active_texture;
GLboolean rendering_to_fbo = ctx->DrawBuffer->Name != 0;
if (format != GL_STENCIL_INDEX)
return GL_FALSE;
@@ -348,14 +349,25 @@ intel_stencil_drawpixels(GLcontext * ctx,
_mesa_free(stencil_pixels);
intel_meta_set_passthrough_transform(intel);
/* Since we're rendering to the framebuffer as if it was an FBO,
* if it's the window system we have to flip the coordinates.
*/
if (rendering_to_fbo) {
y1 = y;
y2 = y + height * ctx->Pixel.ZoomY;
} else {
y1 = irb->Base.Height - (y + height * ctx->Pixel.ZoomY);
y2 = irb->Base.Height - y;
}
vertices[0][0] = x;
vertices[0][1] = y;
vertices[0][1] = y1;
vertices[1][0] = x + width * ctx->Pixel.ZoomX;
vertices[1][1] = y;
vertices[1][1] = y1;
vertices[2][0] = x + width * ctx->Pixel.ZoomX;
vertices[2][1] = y + height * ctx->Pixel.ZoomY;
vertices[2][1] = y2;
vertices[3][0] = x;
vertices[3][1] = y + height * ctx->Pixel.ZoomY;
vertices[3][1] = y2;
_mesa_VertexPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), &vertices);
_mesa_Enable(GL_VERTEX_ARRAY);