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mesa: initial version of _mesa_meta_generate_mipmap()

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Incomplete and totally untested.  Based on intel_generate_mipmap().
This commit is contained in:
Brian Paul 2009-09-06 09:39:47 -06:00
parent 4d63c626d0
commit 23663ae914
2 changed files with 182 additions and 4 deletions
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183
src/mesa/drivers/common/meta.c
View file

@ -37,11 +37,14 @@
#include "main/arrayobj.h"
#include "main/blend.h"
#include "main/bufferobj.h"
#include "main/buffers.h"
#include "main/depth.h"
#include "main/enable.h"
#include "main/fbobject.h"
#include "main/image.h"
#include "main/macros.h"
#include "main/matrix.h"
#include "main/mipmap.h"
#include "main/polygon.h"
#include "main/readpix.h"
#include "main/scissor.h"
@ -210,6 +213,17 @@ struct bitmap_state
};
/**
* State for _mesa_meta_generate_mipmap()
*/
struct gen_mipmap_state
{
GLuint ArrayObj;
GLuint VBO;
GLuint FBO;
};
/**
* All per-context meta state.
*/
@ -224,10 +238,7 @@ struct gl_meta_state
struct copypix_state CopyPix; /**< For _mesa_meta_copy_pixels() */
struct drawpix_state DrawPix; /**< For _mesa_meta_draw_pixels() */
struct bitmap_state Bitmap; /**< For _mesa_meta_bitmap() */
/* other possible meta-ops:
* glGenerateMipmap()
*/
struct gen_mipmap_state Mipmap; /**< For _mesa_meta_generate_mipmap() */
};
@ -1840,3 +1851,167 @@ _mesa_meta_bitmap(GLcontext *ctx,
_mesa_meta_end(ctx);
}
void
_mesa_meta_generate_mipmap(GLcontext *ctx, GLenum target,
struct gl_texture_object *texObj)
{
struct gen_mipmap_state *mipmap = &ctx->Meta->Mipmap;
struct { GLfloat x, y, s, t, r; } verts[4];
const GLuint baseLevel = texObj->BaseLevel;
const GLuint maxLevel = texObj->MaxLevel;
const GLenum minFilterSave = texObj->MinFilter;
const GLenum magFilterSave = texObj->MagFilter;
const GLuint fboSave = ctx->DrawBuffer->Name;
GLenum faceTarget;
GLuint level;
GLuint border = 0;
/* check for fallbacks */
if (!ctx->Extensions.EXT_framebuffer_object) {
_mesa_generate_mipmap(ctx, target, texObj);
return;
}
if (target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z) {
faceTarget = target;
target = GL_TEXTURE_CUBE_MAP;
}
else {
faceTarget = target;
}
_mesa_meta_begin(ctx, META_ALL);
if (mipmap->ArrayObj == 0) {
/* one-time setup */
/* create vertex array object */
_mesa_GenVertexArraysAPPLE(1, &mipmap->ArrayObj);
_mesa_BindVertexArrayAPPLE(mipmap->ArrayObj);
/* create vertex array buffer */
_mesa_GenBuffersARB(1, &mipmap->VBO);
_mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, mipmap->VBO);
_mesa_BufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts),
NULL, GL_DYNAMIC_DRAW_ARB);
/* setup vertex arrays */
_mesa_VertexPointer(2, GL_FLOAT, sizeof(verts[0]),
(void *) (0 * sizeof(GLfloat)));
_mesa_TexCoordPointer(3, GL_FLOAT, sizeof(verts[0]),
(void *) (2 * sizeof(GLfloat)));
_mesa_EnableClientState(GL_VERTEX_ARRAY);
_mesa_EnableClientState(GL_TEXTURE_COORD_ARRAY);
}
else {
_mesa_BindVertexArray(mipmap->ArrayObj);
_mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, mipmap->VBO);
}
if (!mipmap->FBO) {
/* Bind the new renderbuffer to the color attachment point. */
_mesa_GenFramebuffersEXT(1, &mipmap->FBO);
}
_mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, mipmap->FBO);
_mesa_TexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
_mesa_TexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
_mesa_set_enable(ctx, target, GL_TRUE);
/* setup texcoords once (XXX what about border?) */
switch (faceTarget) {
case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
break;
case GL_TEXTURE_2D:
verts[0].s = 0.0F;
verts[0].t = 0.0F;
verts[0].r = 0.0F;
verts[1].s = 1.0F;
verts[1].t = 0.0F;
verts[2].r = 0.0F;
verts[3].s = 1.0F;
verts[3].t = 1.0F;
verts[3].r = 0.0F;
verts[4].s = 0.0F;
verts[4].t = 1.0F;
verts[4].r = 0.0F;
break;
}
for (level = baseLevel + 1; level <= maxLevel; level++) {
const struct gl_texture_image *srcImage;
const GLuint srcLevel = level - 1;
GLsizei srcWidth, srcHeight;
GLsizei newWidth, newHeight;
GLenum status;
srcImage = _mesa_select_tex_image(ctx, texObj, target, srcLevel);
assert(srcImage->Border == 0); /* XXX we can fix this */
srcWidth = srcImage->Width - 2 * border;
srcHeight = srcImage->Height - 2 * border;
newWidth = MAX2(1, srcWidth / 2) + 2 * border;
newHeight = MAX2(1, srcHeight / 2) + 2 * border;
if (newWidth == srcImage->Width && newHeight == srcImage->Height) {
break;
}
/* Create empty image */
_mesa_TexImage2D(GL_TEXTURE_2D, level, srcImage->InternalFormat,
newWidth, newHeight, border,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
/* vertex positions */
{
verts[0].x = 0.0F;
verts[0].y = 0.0F;
verts[1].x = (GLfloat) newWidth;
verts[1].y = 0.0F;
verts[2].x = (GLfloat) newWidth;
verts[2].y = (GLfloat) newHeight;
verts[3].x = 0.0F;
verts[3].y = (GLfloat) newHeight;
/* upload new vertex data */
_mesa_BufferSubDataARB(GL_ARRAY_BUFFER_ARB, 0, sizeof(verts), verts);
}
/* limit sampling to src level */
_mesa_TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, srcLevel);
_mesa_TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, srcLevel);
/* Set to draw into the current level */
_mesa_FramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,
target,
texObj->Name,
level);
/* Choose to render to the color attachment. */
_mesa_DrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
status = _mesa_CheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
abort();
break;
}
_mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
}
_mesa_meta_end(ctx);
_mesa_TexParameteri(target, GL_TEXTURE_MIN_FILTER, minFilterSave);
_mesa_TexParameteri(target, GL_TEXTURE_MAG_FILTER, magFilterSave);
/* restore (XXX add to meta_begin/end()? */
_mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboSave);
}

3
src/mesa/drivers/common/meta.h
View file

@ -83,6 +83,9 @@ _mesa_meta_bitmap(GLcontext *ctx,
const struct gl_pixelstore_attrib *unpack,
const GLubyte *bitmap);
extern void
_mesa_meta_generate_mipmap(GLcontext *ctx, GLenum target,
struct gl_texture_object *texObj);
#endif /* META_H */