[Mesa-dev] [PATCH 01/11] meta: handle subimages in _mesa_meta_setup_texture_coords()
Brian Paul
brianp at vmware.com
Sat Dec 13 06:42:44 PST 2014
In preparation for getting texture sub images.
---
src/mesa/drivers/common/meta.c | 88 +++++++++++++++++---------
src/mesa/drivers/common/meta.h | 4 ++
src/mesa/drivers/common/meta_generate_mipmap.c | 4 +-
3 files changed, 64 insertions(+), 32 deletions(-)
diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index 87532c1..a84e512 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -2450,30 +2450,53 @@ _mesa_meta_Bitmap(struct gl_context *ctx,
/**
* Compute the texture coordinates for the four vertices of a quad for
- * drawing a 2D texture image or slice of a cube/3D texture.
+ * drawing a 2D texture image or slice of a cube/3D texture. The offset
+ * and width, height specify a sub-region of the 2D image.
+ *
* \param faceTarget GL_TEXTURE_1D/2D/3D or cube face name
* \param slice slice of a 1D/2D array texture or 3D texture
- * \param width width of the texture image
- * \param height height of the texture image
+ * \param xoffset X position of sub texture
+ * \param yoffset Y position of sub texture
+ * \param width width of the sub texture image
+ * \param height height of the sub texture image
+ * \param total_width total width of the texture image
+ * \param total_height total height of the texture image
+ * \param total_depth total depth of the texture image
* \param coords0/1/2/3 returns the computed texcoords
*/
void
_mesa_meta_setup_texture_coords(GLenum faceTarget,
GLint slice,
+ GLint xoffset,
+ GLint yoffset,
GLint width,
GLint height,
- GLint depth,
+ GLint total_width,
+ GLint total_height,
+ GLint total_depth,
GLfloat coords0[4],
GLfloat coords1[4],
GLfloat coords2[4],
GLfloat coords3[4])
{
- static const GLfloat st[4][2] = {
- {0.0f, 0.0f}, {1.0f, 0.0f}, {1.0f, 1.0f}, {0.0f, 1.0f}
- };
+ float st[4][2];
GLuint i;
+ const float s0 = (float) xoffset / (float) total_width;
+ const float s1 = (float) (xoffset + width) / (float) total_width;
+ const float t0 = (float) yoffset / (float) total_height;
+ const float t1 = (float) (yoffset + height) / (float) total_height;
GLfloat r;
+ /* setup the reference texcoords */
+ st[0][0] = s0;
+ st[0][1] = t0;
+ st[1][0] = s1;
+ st[1][1] = t0;
+ st[2][0] = s1;
+ st[2][1] = t1;
+ st[3][0] = s0;
+ st[3][1] = t1;
+
if (faceTarget == GL_TEXTURE_CUBE_MAP_ARRAY)
faceTarget = GL_TEXTURE_CUBE_MAP_POSITIVE_X + slice % 6;
@@ -2490,52 +2513,52 @@ _mesa_meta_setup_texture_coords(GLenum faceTarget,
case GL_TEXTURE_3D:
case GL_TEXTURE_2D_ARRAY:
if (faceTarget == GL_TEXTURE_3D) {
- assert(slice < depth);
- assert(depth >= 1);
- r = (slice + 0.5f) / depth;
+ assert(slice < total_depth);
+ assert(total_depth >= 1);
+ r = (slice + 0.5f) / total_depth;
}
else if (faceTarget == GL_TEXTURE_2D_ARRAY)
r = (float) slice;
else
r = 0.0F;
- coords0[0] = 0.0F; /* s */
- coords0[1] = 0.0F; /* t */
+ coords0[0] = st[0][0]; /* s */
+ coords0[1] = st[0][1]; /* t */
coords0[2] = r; /* r */
- coords1[0] = 1.0F;
- coords1[1] = 0.0F;
+ coords1[0] = st[1][0];
+ coords1[1] = st[1][1];
coords1[2] = r;
- coords2[0] = 1.0F;
- coords2[1] = 1.0F;
+ coords2[0] = st[2][0];
+ coords2[1] = st[2][1];
coords2[2] = r;
- coords3[0] = 0.0F;
- coords3[1] = 1.0F;
+ coords3[0] = st[3][0];
+ coords3[1] = st[3][1];
coords3[2] = r;
break;
case GL_TEXTURE_RECTANGLE_ARB:
- coords0[0] = 0.0F; /* s */
- coords0[1] = 0.0F; /* t */
+ coords0[0] = (float) xoffset; /* s */
+ coords0[1] = (float) yoffset; /* t */
coords0[2] = 0.0F; /* r */
- coords1[0] = (float) width;
- coords1[1] = 0.0F;
+ coords1[0] = (float) (xoffset + width);
+ coords1[1] = (float) yoffset;
coords1[2] = 0.0F;
- coords2[0] = (float) width;
- coords2[1] = (float) height;
+ coords2[0] = (float) (xoffset + width);
+ coords2[1] = (float) (yoffset + height);
coords2[2] = 0.0F;
- coords3[0] = 0.0F;
- coords3[1] = (float) height;
+ coords3[0] = (float) xoffset;
+ coords3[1] = (float) (yoffset + height);
coords3[2] = 0.0F;
break;
case GL_TEXTURE_1D_ARRAY:
- coords0[0] = 0.0F; /* s */
+ coords0[0] = st[0][0]; /* s */
coords0[1] = (float) slice; /* t */
coords0[2] = 0.0F; /* r */
- coords1[0] = 1.0f;
+ coords1[0] = st[1][0];
coords1[1] = (float) slice;
coords1[2] = 0.0F;
- coords2[0] = 1.0F;
+ coords2[0] = st[2][0];
coords2[1] = (float) slice;
coords2[2] = 0.0F;
- coords3[0] = 0.0F;
+ coords3[0] = st[3][0];
coords3[1] = (float) slice;
coords3[2] = 0.0F;
break;
@@ -3069,7 +3092,10 @@ decompress_texture_image(struct gl_context *ctx,
/* Silence valgrind warnings about reading uninitialized stack. */
memset(verts, 0, sizeof(verts));
- _mesa_meta_setup_texture_coords(faceTarget, slice, width, height, depth,
+ _mesa_meta_setup_texture_coords(faceTarget, slice,
+ 0, 0, width, height,
+ texImage->Width, texImage->Height,
+ texImage->Depth,
verts[0].tex,
verts[1].tex,
verts[2].tex,
diff --git a/src/mesa/drivers/common/meta.h b/src/mesa/drivers/common/meta.h
index 6ecf3c0..03e5191 100644
--- a/src/mesa/drivers/common/meta.h
+++ b/src/mesa/drivers/common/meta.h
@@ -569,9 +569,13 @@ _mesa_meta_alloc_texture(struct temp_texture *tex,
void
_mesa_meta_setup_texture_coords(GLenum faceTarget,
GLint slice,
+ GLint xoffset,
+ GLint yoffset,
GLint width,
GLint height,
GLint depth,
+ GLint total_width,
+ GLint total_height,
GLfloat coords0[4],
GLfloat coords1[4],
GLfloat coords2[4],
diff --git a/src/mesa/drivers/common/meta_generate_mipmap.c b/src/mesa/drivers/common/meta_generate_mipmap.c
index 8ffd8da..58b9a53 100644
--- a/src/mesa/drivers/common/meta_generate_mipmap.c
+++ b/src/mesa/drivers/common/meta_generate_mipmap.c
@@ -317,7 +317,9 @@ _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
/* Setup texture coordinates */
_mesa_meta_setup_texture_coords(faceTarget,
layer,
- 0, 0, 1, /* width, height never used here */
+ 0, 0, /* xoffset, yoffset */
+ srcWidth, srcHeight, /* img size */
+ srcWidth, srcHeight, srcDepth,
verts[0].tex,
verts[1].tex,
verts[2].tex,
--
1.9.1
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