diff options
Diffstat (limited to 'src/mesa/drivers/common/meta.c')
| -rw-r--r-- | src/mesa/drivers/common/meta.c | 182 |
1 files changed, 181 insertions, 1 deletions
diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c index 9638e9bc7cf..79e93d648b7 100644 --- a/src/mesa/drivers/common/meta.c +++ b/src/mesa/drivers/common/meta.c @@ -174,6 +174,21 @@ struct copypix_state /** + * State for glDrawPixels() + */ +struct drawpix_state +{ + GLuint TexObj; + GLsizei TexWidth, TexHeight; + GLenum TexIntFormat; + GLuint ArrayObj; + GLuint VBO; + GLfloat verts[4][5]; /** four verts of X,Y,Z,S,T */ +}; + + + +/** * All per-context meta state. */ struct gl_meta_state @@ -183,11 +198,12 @@ struct gl_meta_state struct blit_state Blit; /**< For _mesa_meta_blit_framebuffer() */ struct clear_state Clear; /**< For _mesa_meta_clear() */ struct copypix_state CopyPix; /**< For _mesa_meta_copy_pixels() */ + struct drawpix_state DrawPix; /**< For _mesa_meta_draw_pixels() */ /* other possible meta-ops: * glDrawPixels() - * glCopyPixels() * glBitmap() + * glGenerateMipmap() */ }; @@ -231,6 +247,12 @@ _mesa_meta_free(GLcontext *ctx) _mesa_DeleteVertexArraysAPPLE(1, &meta->CopyPix.ArrayObj); } + if (meta->DrawPix.TexObj) { + _mesa_DeleteTextures(1, &meta->DrawPix.TexObj); + _mesa_DeleteBuffersARB(1, & meta->DrawPix.VBO); + _mesa_DeleteVertexArraysAPPLE(1, &meta->DrawPix.ArrayObj); + } + _mesa_free(ctx->Meta); ctx->Meta = NULL; } @@ -1022,3 +1044,161 @@ _mesa_meta_copy_pixels(GLcontext *ctx, GLint srcX, GLint srcY, _mesa_meta_end(ctx); } + + + +/** + * Meta implementation of ctx->Driver.DrawPixels() in terms + * of texture mapping and polygon rendering. + * Note: this function requires GL_ARB_texture_rectangle support. + */ +void +_mesa_meta_draw_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 GLenum filter = GL_NEAREST; + struct drawpix_state *drawpix = &ctx->Meta->DrawPix; + const GLfloat z = ctx->Current.RasterPos[2]; + const GLfloat x1 = x + width * ctx->Pixel.ZoomX; + const GLfloat y1 = y + height * ctx->Pixel.ZoomY; + const struct gl_pixelstore_attrib unpackSave = ctx->Unpack; + GLenum texIntFormat; + GLboolean fallback; + + ASSERT(ctx->Extensions.NV_texture_rectangle); + + /* + * Determine if we can do the glDrawPixels with texture mapping. + */ + fallback = GL_FALSE; + if (ctx->_ImageTransferState || + ctx->Fog.Enabled || + width > ctx->Const.MaxTextureRectSize || + height > ctx->Const.MaxTextureRectSize) { + fallback = GL_TRUE; + } + + if (_mesa_is_color_format(format)) { + texIntFormat = GL_RGBA; + } + else { + fallback = GL_TRUE; + } + + if (fallback) { + _swrast_DrawPixels(ctx, x, y, width, height, + format, type, unpack, pixels); + return; + } + + /* Most GL state applies to glDrawPixels, but a there's a few things + * we need to override: + */ + _mesa_meta_begin(ctx, (META_RASTERIZATION | + META_SHADER | + META_TEXTURE | + META_TRANSFORM | + META_VERTEX | + META_VIEWPORT)); + + if (drawpix->TexObj == 0) { + /* one-time setup */ + + /* create texture object */ + _mesa_GenTextures(1, &drawpix->TexObj); + _mesa_BindTexture(GL_TEXTURE_RECTANGLE, drawpix->TexObj); + _mesa_TexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); + _mesa_TexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, filter); + _mesa_TexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, filter); + } + else { + _mesa_BindTexture(GL_TEXTURE_RECTANGLE, drawpix->TexObj); + } + + if (drawpix->ArrayObj == 0) { + /* one-time setup */ + + /* create vertex array object */ + _mesa_GenVertexArrays(1, &drawpix->ArrayObj); + _mesa_BindVertexArray(drawpix->ArrayObj); + + /* create vertex array buffer */ + _mesa_GenBuffersARB(1, &drawpix->VBO); + _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, drawpix->VBO); + _mesa_BufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(drawpix->verts), + drawpix->verts, GL_STREAM_DRAW_ARB); + + /* setup vertex arrays */ + _mesa_VertexPointer(3, GL_FLOAT, sizeof(drawpix->verts[0]), + (void*) (0 * sizeof(GLfloat))); + _mesa_TexCoordPointer(2, GL_FLOAT, sizeof(drawpix->verts[0]), + (void *) (3 * sizeof(GLfloat))); + _mesa_EnableClientState(GL_VERTEX_ARRAY); + _mesa_EnableClientState(GL_TEXTURE_COORD_ARRAY); + } + else { + _mesa_BindVertexArray(drawpix->ArrayObj); + _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, drawpix->VBO); + } + + /* vertex positions, texcoords */ + drawpix->verts[0][0] = (GLfloat) x; + drawpix->verts[0][1] = (GLfloat) y; + drawpix->verts[0][2] = z; + drawpix->verts[0][3] = 0.0F; + drawpix->verts[0][4] = 0.0F; + drawpix->verts[1][0] = (GLfloat) x1; + drawpix->verts[1][1] = (GLfloat) y; + drawpix->verts[1][2] = z; + drawpix->verts[1][3] = (GLfloat) width; + drawpix->verts[1][4] = 0.0F; + drawpix->verts[2][0] = (GLfloat) x1; + drawpix->verts[2][1] = (GLfloat) y1; + drawpix->verts[2][2] = z; + drawpix->verts[2][3] = (GLfloat) width; + drawpix->verts[2][4] = (GLfloat) height; + drawpix->verts[3][0] = (GLfloat) x; + drawpix->verts[3][1] = (GLfloat) y1; + drawpix->verts[3][2] = z; + drawpix->verts[3][3] = 0.0F; + drawpix->verts[3][4] = (GLfloat) height; + + /* upload new vertex data */ + _mesa_BufferSubDataARB(GL_ARRAY_BUFFER_ARB, 0, + sizeof(drawpix->verts), drawpix->verts); + + /* set given unpack params */ + ctx->Unpack = *unpack; /* XXX bufobj */ + + /* copy pixel data to texture */ + if (drawpix->TexWidth == width && + drawpix->TexHeight == height && + drawpix->TexIntFormat == texIntFormat) { + /* replace existing tex image */ + _mesa_TexSubImage2D(GL_TEXTURE_RECTANGLE, 0, + 0, 0, width, height, format, type, pixels); + } + else { + /* create new tex image */ + _mesa_TexImage2D(GL_TEXTURE_RECTANGLE, 0, texIntFormat, + width, height, 0, format, type, pixels); + drawpix->TexWidth = width; + drawpix->TexHeight = height; + drawpix->TexIntFormat = texIntFormat; + } + + /* restore unpack params */ + ctx->Unpack = unpackSave; /* XXX bufobj */ + + _mesa_Enable(GL_TEXTURE_RECTANGLE); + + /* draw textured quad */ + _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4); + + _mesa_Disable(GL_TEXTURE_RECTANGLE); + + _mesa_meta_end(ctx); +} |