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i965: fix polygon culling bug when rendering to a texture/FBO

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Since we use an inverted viewport transformation for render to texture, that
inverts front/back polygon orientation.
Now glCullFace(GL_FRONT / GL_BACK) works correctly.
This commit is contained in:
Brian Paul 2009-01-16 13:33:19 -07:00
parent 345a08a77f
commit a61a1a8181
1 changed files with 13 additions and 12 deletions
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25
src/mesa/drivers/dri/i965/brw_sf_state.c
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@ -42,22 +42,15 @@ static void upload_sf_vp(struct brw_context *brw)
GLcontext *ctx = &brw->intel.ctx;
const GLfloat depth_scale = 1.0F / ctx->DrawBuffer->_DepthMaxF;
struct brw_sf_viewport sfv;
struct intel_renderbuffer *irb =
intel_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]);
GLfloat y_scale, y_bias;
memset(&sfv, 0, sizeof(sfv));
if (ctx->DrawBuffer->Name) {
/* User-created FBO */
if (irb && !irb->RenderToTexture) {
y_scale = -1.0;
y_bias = ctx->DrawBuffer->Height;
} else {
y_scale = 1.0;
y_bias = 0;
}
} else {
if (intel_rendering_to_texture(ctx)) {
y_scale = 1.0;
y_bias = 0;
}
else {
y_scale = -1.0;
y_bias = ctx->DrawBuffer->Height;
}
@ -120,6 +113,7 @@ struct brw_sf_unit_key {
GLboolean scissor, line_smooth, point_sprite, point_attenuated;
float line_width;
float point_size;
GLboolean render_to_texture;
};
static void
@ -150,6 +144,8 @@ sf_unit_populate_key(struct brw_context *brw, struct brw_sf_unit_key *key)
key->point_sprite = brw->attribs.Point->PointSprite;
key->point_size = brw->attribs.Point->Size;
key->point_attenuated = brw->attribs.Point->_Attenuated;
key->render_to_texture = intel_rendering_to_texture(&brw->intel.ctx);
}
static dri_bo *
@ -196,6 +192,11 @@ sf_unit_create_from_key(struct brw_context *brw, struct brw_sf_unit_key *key,
else
sf.sf5.front_winding = BRW_FRONTWINDING_CW;
/* The viewport is inverted for rendering to texture, and that inverts
* polygon front/back orientation.
*/
sf.sf5.front_winding ^= key->render_to_texture;
switch (key->cull_face) {
case GL_FRONT:
sf.sf6.cull_mode = BRW_CULLMODE_FRONT;