From c16fa388d3f1b941fbee2909a92b6fea10ef4bfe Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Mon, 10 Aug 2009 14:43:15 -0600 Subject: [PATCH] mesa: initial meta implementation of glCopyPixels() --- src/mesa/drivers/common/meta.c | 161 +++++++++++++++++++++++++++++++++ src/mesa/drivers/common/meta.h | 5 + 2 files changed, 166 insertions(+) diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c index c68be2e5691..7a3969d9aa8 100644 --- a/src/mesa/drivers/common/meta.c +++ b/src/mesa/drivers/common/meta.c @@ -154,6 +154,21 @@ struct clear_state }; +/** + * State for glCopyPixels() + */ +struct copypix_state +{ + GLuint TexObj; + GLsizei TexWidth, TexHeight; + GLenum TexType; + GLuint ArrayObj; + GLuint VBO; + GLfloat verts[4][5]; /** four verts of X,Y,Z,S,T */ +}; + + + /** * All per-context meta state. */ @@ -163,6 +178,7 @@ 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() */ /* other possible meta-ops: * glDrawPixels() @@ -205,6 +221,12 @@ _mesa_meta_free(GLcontext *ctx) _mesa_DeleteVertexArraysAPPLE(1, &meta->Clear.ArrayObj); } + if (meta->CopyPix.TexObj) { + _mesa_DeleteTextures(1, &meta->CopyPix.TexObj); + _mesa_DeleteBuffersARB(1, & meta->CopyPix.VBO); + _mesa_DeleteVertexArraysAPPLE(1, &meta->CopyPix.ArrayObj); + } + _mesa_free(ctx->Meta); ctx->Meta = NULL; } @@ -810,3 +832,142 @@ _mesa_meta_clear(GLcontext *ctx, GLbitfield buffers) _mesa_meta_end(ctx); } + +/** + * Meta implementation of ctx->Driver.CopyPixels() in terms + * of texture mapping and polygon rendering. + * Note: this function requires GL_ARB_texture_rectangle support. + */ +void +_mesa_meta_copy_pixels(GLcontext *ctx, GLint srcX, GLint srcY, + GLsizei width, GLsizei height, + GLint dstX, GLint dstY, GLenum type) +{ + const GLenum filter = GL_NEAREST; + struct copypix_state *copypix = &ctx->Meta->CopyPix; + const GLfloat z = ctx->Current.RasterPos[2]; + const GLfloat dstX1 = dstX + width * ctx->Pixel.ZoomX; + const GLfloat dstY1 = dstY + height * ctx->Pixel.ZoomY; + + ASSERT(ctx->Extensions.NV_texture_rectangle); + + if (type != GL_COLOR || + ctx->_ImageTransferState || + width > ctx->Const.MaxTextureRectSize || + height > ctx->Const.MaxTextureRectSize) { + /* XXX avoid this fallback */ + _swrast_CopyPixels(ctx, srcX, srcY, width, height, dstX, dstY, type); + return; + } + + /* Most GL state applies to glCopyPixels, but a there's a few things + * we need to override: + */ + _mesa_meta_begin(ctx, (META_RASTERIZATION | + META_SHADER | + META_TRANSFORM | + META_VERTEX)); + + if (copypix->TexObj == 0) { + /* one-time setup */ + + /* create texture object */ + _mesa_GenTextures(1, ©pix->TexObj); + _mesa_BindTexture(GL_TEXTURE_RECTANGLE, copypix->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, copypix->TexObj); + } + + if (copypix->ArrayObj == 0) { + /* one-time setup */ + + /* create vertex array object */ + _mesa_GenVertexArrays(1, ©pix->ArrayObj); + _mesa_BindVertexArray(copypix->ArrayObj); + + /* create vertex array buffer */ + _mesa_GenBuffersARB(1, ©pix->VBO); + _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, copypix->VBO); + _mesa_BufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(copypix->verts), + copypix->verts, GL_STREAM_DRAW_ARB); + + /* setup vertex arrays */ + _mesa_VertexPointer(3, GL_FLOAT, sizeof(copypix->verts[0]), + (void*) (0 * sizeof(GLfloat))); + _mesa_TexCoordPointer(2, GL_FLOAT, sizeof(copypix->verts[0]), + (void *) (3 * sizeof(GLfloat))); + _mesa_EnableClientState(GL_VERTEX_ARRAY); + _mesa_EnableClientState(GL_TEXTURE_COORD_ARRAY); + } + else { + _mesa_BindVertexArray(copypix->ArrayObj); + _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, copypix->VBO); + } + + /* vertex positions, texcoords */ + copypix->verts[0][0] = (GLfloat) dstX; + copypix->verts[0][1] = (GLfloat) dstY; + copypix->verts[0][2] = z; + copypix->verts[0][3] = 0.0F; + copypix->verts[0][4] = 0.0F; + copypix->verts[1][0] = (GLfloat) dstX1; + copypix->verts[1][1] = (GLfloat) dstY; + copypix->verts[1][2] = z; + copypix->verts[1][3] = (GLfloat) width; + copypix->verts[1][4] = 0.0F; + copypix->verts[2][0] = (GLfloat) dstX1; + copypix->verts[2][1] = (GLfloat) dstY1; + copypix->verts[2][2] = z; + copypix->verts[2][3] = (GLfloat) width; + copypix->verts[2][4] = (GLfloat) height; + copypix->verts[3][0] = (GLfloat) dstX; + copypix->verts[3][1] = (GLfloat) dstY1; + copypix->verts[3][2] = z; + copypix->verts[3][3] = 0.0F; + copypix->verts[3][4] = (GLfloat) height; + + /* upload new vertex data */ + _mesa_BufferSubDataARB(GL_ARRAY_BUFFER_ARB, 0, + sizeof(copypix->verts), copypix->verts); + + /* copy framebuffer image to texture */ + if (type == GL_COLOR) { + if (copypix->TexWidth == width && + copypix->TexHeight == height && + copypix->TexType == type) { + /* replace existing tex image */ + _mesa_CopyTexSubImage2D(GL_TEXTURE_RECTANGLE, 0, + 0, 0, srcX, srcY, width, height); + } + else { + /* create new tex image */ + _mesa_CopyTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA, + srcX, srcY, width, height, 0); + copypix->TexWidth = width; + copypix->TexHeight = height; + copypix->TexType = type; + } + } + else if (type == GL_DEPTH) { + /* TO-DO: Use a GL_DEPTH_COMPONENT texture and a fragment program/shader + * that replaces the fragment.z value. + */ + } + else { + ASSERT(type == GL_STENCIL); + /* have to use sw fallback */ + } + + _mesa_Enable(GL_TEXTURE_RECTANGLE); + + /* draw textured quad */ + _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4); + + _mesa_Disable(GL_TEXTURE_RECTANGLE); + + _mesa_meta_end(ctx); +} diff --git a/src/mesa/drivers/common/meta.h b/src/mesa/drivers/common/meta.h index b63ad99d5e0..b66d20c3442 100644 --- a/src/mesa/drivers/common/meta.h +++ b/src/mesa/drivers/common/meta.h @@ -63,5 +63,10 @@ _mesa_meta_blit_framebuffer(GLcontext *ctx, extern void _mesa_meta_clear(GLcontext *ctx, GLbitfield buffers); +extern void +_mesa_meta_copy_pixels(GLcontext *ctx, GLint srcx, GLint srcy, + GLsizei width, GLsizei height, + GLint dstx, GLint dsty, GLenum type); + #endif /* META_H */ -- 2.30.2