diff options
| -rw-r--r-- | src/mesa/drivers/common/meta.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c index 20d47dc38b..12e0bdde88 100644 --- a/src/mesa/drivers/common/meta.c +++ b/src/mesa/drivers/common/meta.c @@ -1054,6 +1054,124 @@ init_blit_depth_pixels(GLcontext *ctx) /** + * Try to do a glBiltFramebuffer using no-copy texturing. + * We can do this when the src renderbuffer is actually a texture. + * But if the src buffer == dst buffer we cannot do this. + * + * \return new buffer mask indicating the buffers left to blit using the + * normal path. + */ +static GLbitfield +blitframebuffer_texture(GLcontext *ctx, + GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, + GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, + GLbitfield mask, GLenum filter) +{ + if (mask & GL_COLOR_BUFFER_BIT) { + const struct gl_framebuffer *drawFb = ctx->DrawBuffer; + const struct gl_framebuffer *readFb = ctx->ReadBuffer; + const struct gl_renderbuffer_attachment *drawAtt = + &drawFb->Attachment[drawFb->_ColorDrawBufferIndexes[0]]; + const struct gl_renderbuffer_attachment *readAtt = + &readFb->Attachment[readFb->_ColorReadBufferIndex]; + + if (readAtt && readAtt->Texture) { + const struct gl_texture_object *texObj = readAtt->Texture; + const GLenum minFilterSave = texObj->MinFilter; + const GLenum magFilterSave = texObj->MagFilter; + const GLenum target = texObj->Target; + + if (drawAtt->Texture == readAtt->Texture) { + /* Can't use same texture as both the source and dest. We need + * to handle overlapping blits and besides, some hw may not + * support this. + */ + return mask; + } + + if (target != GL_TEXTURE_2D && target != GL_TEXTURE_RECTANGLE_ARB) { + /* Can't handle other texture types at this time */ + return mask; + } + + /* + printf("Blit from texture!\n"); + printf(" srcAtt %p dstAtt %p\n", readAtt, drawAtt); + printf(" srcTex %p dstText %p\n", texObj, drawAtt->Texture); + */ + + /* Prepare src texture state */ + _mesa_BindTexture(target, texObj->Name); + _mesa_TexParameteri(target, GL_TEXTURE_MIN_FILTER, filter); + _mesa_TexParameteri(target, GL_TEXTURE_MAG_FILTER, filter); + _mesa_TexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); + /*_mesa_set_enable(ctx, GL_TEXTURE_RECTANGLE, GL_FALSE);*/ + _mesa_set_enable(ctx, target, GL_TRUE); + + /* Prepare vertex data (the VBO was previously created and bound) */ + { + struct vertex { + GLfloat x, y, s, t; + }; + struct vertex verts[4]; + GLfloat s0, t0, s1, t1; + + if (target == GL_TEXTURE_2D) { + const struct gl_texture_image *texImage + = _mesa_select_tex_image(ctx, texObj, target, + readAtt->TextureLevel); + s0 = srcX0 / (float) texImage->Width; + s1 = srcX1 / (float) texImage->Width; + t0 = srcY0 / (float) texImage->Height; + t1 = srcY1 / (float) texImage->Height; + } + else { + assert(target == GL_TEXTURE_RECTANGLE_ARB); + s0 = srcX0; + s1 = srcX1; + t0 = srcY0; + t1 = srcY1; + } + + verts[0].x = (GLfloat) dstX0; + verts[0].y = (GLfloat) dstY0; + verts[1].x = (GLfloat) dstX1; + verts[1].y = (GLfloat) dstY0; + verts[2].x = (GLfloat) dstX1; + verts[2].y = (GLfloat) dstY1; + verts[3].x = (GLfloat) dstX0; + verts[3].y = (GLfloat) dstY1; + + verts[0].s = s0; + verts[0].t = t0; + verts[1].s = s1; + verts[1].t = t0; + verts[2].s = s1; + verts[2].t = t1; + verts[3].s = s0; + verts[3].t = t1; + + _mesa_BufferSubDataARB(GL_ARRAY_BUFFER_ARB, 0, sizeof(verts), verts); + } + + _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4); + + /* Restore texture's filter state, the texture binding will + * be restored by _mesa_meta_end(). + */ + _mesa_TexParameteri(target, GL_TEXTURE_MIN_FILTER, minFilterSave); + _mesa_TexParameteri(target, GL_TEXTURE_MAG_FILTER, magFilterSave); + + /* Done with color buffer */ + mask &= ~GL_COLOR_BUFFER_BIT; + } + } + + return mask; +} + + +/** * Meta implementation of ctx->Driver.BlitFramebuffer() in terms * of texture mapping and polygon rendering. */ @@ -1124,6 +1242,18 @@ _mesa_meta_BlitFramebuffer(GLcontext *ctx, _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, blit->VBO); } + /* Try faster, direct texture approach first */ + mask = blitframebuffer_texture(ctx, srcX0, srcY0, srcX1, srcY1, + dstX0, dstY0, dstX1, dstY1, mask, filter); + if (mask == 0x0) { + _mesa_meta_end(ctx); + return; + } + + /* Continue with "normal" approach which involves copying the src rect + * into a temporary texture and is "blitted" by drawing a textured quad. + */ + newTex = alloc_texture(tex, srcW, srcH, GL_RGBA); /* vertex positions/texcoords (after texture allocation!) */ |