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mesa: initial meta implementation of glCopyPixels()

This commit is contained in:
Brian Paul 2009-08-10 14:43:15 -06:00
parent 36a222cf04
commit c16fa388d3
2 changed files with 166 additions and 0 deletions
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161
src/mesa/drivers/common/meta.c
View File

@ -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, &copypix->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, &copypix->ArrayObj);
_mesa_BindVertexArray(copypix->ArrayObj);
/* create vertex array buffer */
_mesa_GenBuffersARB(1, &copypix->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);
}

5
src/mesa/drivers/common/meta.h
View File

@ -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 */