Mesa (master): mesa: initial meta implementation of glCopyPixels()
Brian Paul
brianp at kemper.freedesktop.org
Mon Aug 10 21:48:59 UTC 2009
Module: Mesa
Branch: master
Commit: c16fa388d3f1b941fbee2909a92b6fea10ef4bfe
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=c16fa388d3f1b941fbee2909a92b6fea10ef4bfe
Author: Brian Paul <brianp at vmware.com>
Date: Mon Aug 10 14:43:15 2009 -0600
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(+), 0 deletions(-)
diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index c68be2e..7a3969d 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -155,6 +155,21 @@ 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.
*/
struct gl_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 b63ad99..b66d20c 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 */
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