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assert texture buffer is correct size

This commit is contained in:
David Rose 2001-07-02 20:42:13 +00:00
parent f3925b1695
commit 2afbb2efa3
1 changed files with 72 additions and 1 deletions
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73
panda/src/glgsg/glGraphicsStateGuardian.cxx
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@ -3719,6 +3719,68 @@ specify_texture(Texture *tex) {
report_errors();
}
#ifndef NDEBUG
////////////////////////////////////////////////////////////////////
// Function: compute_gl_image_size
// Description: Calculates how many bytes GL will expect to read for
// a texture image, based on the number of pixels and
// the GL format and type. This is only used for
// debugging.
////////////////////////////////////////////////////////////////////
static int
compute_gl_image_size(int xsize, int ysize, int external_format, int type) {
int num_components = 0;
switch (external_format) {
case GL_COLOR_INDEX:
case GL_STENCIL_INDEX:
case GL_DEPTH_COMPONENT:
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_ALPHA:
case GL_LUMINANCE:
num_components = 1;
break;
case GL_LUMINANCE_ALPHA:
num_components = 2;
break;
case GL_RGB:
num_components = 3;
break;
case GL_RGBA:
num_components = 4;
break;
}
int pixel_width = 0;
switch (type) {
case GL_UNSIGNED_BYTE:
pixel_width = 1 * num_components;
break;
case GL_UNSIGNED_SHORT:
pixel_width = 2 * num_components;
break;
#ifdef GL_UNSIGNED_BYTE_3_3_2_EXT
case GL_UNSIGNED_BYTE_3_3_2_EXT:
nassertr(num_components == 3, 0);
pixel_width = 1;
break;
#endif
case GL_FLOAT:
pixel_width = 4 * num_components;
break;
}
return xsize * ysize * pixel_width;
}
#endif // NDEBUG
////////////////////////////////////////////////////////////////////
// Function: GLGraphicsStateGuardian::apply_texture_immediate
@ -3741,6 +3803,15 @@ apply_texture_immediate(Texture *tex) {
GLenum external_format = get_external_image_format(pb->get_format());
GLenum type = get_image_type(pb->get_image_type());
#ifndef NDEBUG
int wanted_size =
compute_gl_image_size(pb->get_xsize(), pb->get_ysize(),
external_format, type);
nassertr(wanted_size == pb->_image.size(), false);
#endif // NDEBUG
set_unpack_alignment(1);
#ifdef GSG_VERBOSE
glgsg_cat.debug()
<< "glTexImage2D(GL_TEXTURE_2D, "
@ -4390,7 +4461,7 @@ save_mipmap_images(Texture *tex) {
int ysize = pb->get_ysize();
// Specify byte-alignment for the pixels on output.
glPixelStorei(GL_PACK_ALIGNMENT, 1);
set_pack_alignment(1);
int mipmap_level = 0;
do {