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gles2gsg: Support gl-depth-zero-to-one in OpenGL ES 2+

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Requires GL_EXT_clip_control support in the driver.
This commit is contained in:
rdb 2021-08-30 14:01:43 +02:00
parent 32b78a382a
commit 481fc67996
4 changed files with 36 additions and 11 deletions
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2
panda/src/gles2gsg/gles2gsg.h
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@ -120,6 +120,8 @@ typedef char GLchar;
#define GL_ONE_MINUS_SRC1_COLOR GL_ONE_MINUS_SRC1_COLOR_EXT
#define GL_SRC1_ALPHA GL_SRC1_ALPHA_EXT
#define GL_ONE_MINUS_SRC1_ALPHA GL_ONE_MINUS_SRC1_ALPHA_EXT
#define GL_LOWER_LEFT GL_LOWER_LEFT_EXT
#define GL_ZERO_TO_ONE GL_ZERO_TO_ONE_EXT
#define GL_DEBUG_OUTPUT_SYNCHRONOUS GL_DEBUG_OUTPUT_SYNCHRONOUS_KHR
#define GL_DEBUG_TYPE_PERFORMANCE GL_DEBUG_TYPE_PERFORMANCE_KHR

14
panda/src/gles2gsg/panda_esgl2ext.h
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@ -1050,6 +1050,20 @@ GL_APICALL void GL_APIENTRY glBufferStorageEXT (GLenum target, GLsizeiptr size,
#endif
#endif /* GL_EXT_buffer_storage */
#ifndef GL_EXT_clip_control
#define GL_EXT_clip_control 1
#define GL_LOWER_LEFT_EXT 0x8CA1
#define GL_UPPER_LEFT_EXT 0x8CA2
#define GL_NEGATIVE_ONE_TO_ONE_EXT 0x935E
#define GL_ZERO_TO_ONE_EXT 0x935F
#define GL_CLIP_ORIGIN_EXT 0x935C
#define GL_CLIP_DEPTH_MODE_EXT 0x935D
typedef void (GL_APIENTRYP PFNGLCLIPCONTROLEXTPROC) (GLenum origin, GLenum depth);
#ifdef GL_GLEXT_PROTOTYPES
GL_APICALL void GL_APIENTRY glClipControlEXT (GLenum origin, GLenum depth);
#endif
#endif /* GL_EXT_clip_control */
#ifndef GL_EXT_color_buffer_float
#define GL_EXT_color_buffer_float 1
#endif /* GL_EXT_color_buffer_float */

27
panda/src/glstuff/glGraphicsStateGuardian_src.cxx
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@ -3293,23 +3293,30 @@ reset() {
#endif
// Set depth range from zero to one if requested.
#ifndef OPENGLES
#ifndef OPENGLES_1
_use_depth_zero_to_one = false;
_use_remapped_depth_range = false;
if (gl_depth_zero_to_one) {
#ifndef OPENGLES
PFNGLCLIPCONTROLPROC pglClipControl = nullptr;
if (is_at_least_gl_version(4, 5) || has_extension("GL_ARB_clip_control")) {
PFNGLCLIPCONTROLPROC pglClipControl =
(PFNGLCLIPCONTROLPROC)get_extension_func("glClipControl");
pglClipControl = (PFNGLCLIPCONTROLPROC)get_extension_func("glClipControl");
}
#else
PFNGLCLIPCONTROLEXTPROC pglClipControl = nullptr;
if (has_extension("GL_EXT_clip_control")) {
pglClipControl = (PFNGLCLIPCONTROLEXTPROC)get_extension_func("glClipControlEXT");
}
#endif
if (pglClipControl != nullptr) {
pglClipControl(GL_LOWER_LEFT, GL_ZERO_TO_ONE);
_use_depth_zero_to_one = true;
if (pglClipControl != nullptr) {
pglClipControl(GL_LOWER_LEFT, GL_ZERO_TO_ONE);
_use_depth_zero_to_one = true;
if (GLCAT.is_debug()) {
GLCAT.debug()
<< "Set zero-to-one depth using glClipControl\n";
}
if (GLCAT.is_debug()) {
GLCAT.debug()
<< "Set zero-to-one depth using glClipControl\n";
}
}/* else if (has_extension("GL_NV_depth_buffer_float")) {
// Alternatively, all GeForce 8+ and even some AMD drivers support this

4
panda/src/glstuff/glGraphicsStateGuardian_src.h
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@ -761,9 +761,11 @@ protected:
#endif
public:
#ifndef OPENGLES
#ifndef OPENGLES_1
bool _use_depth_zero_to_one;
bool _use_remapped_depth_range;
#endif
#ifndef OPENGLES
PFNGLDEPTHRANGEDNVPROC _glDepthRangedNV;
#endif