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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGLUtil_DEFINED
#define GrGLUtil_DEFINED
#include "gl/GrGLInterface.h"
#include "GrGLDefines.h"
////////////////////////////////////////////////////////////////////////////////
typedef uint32_t GrGLVersion;
typedef uint32_t GrGLSLVersion;
#define GR_GL_VER(major, minor) ((static_cast<int>(major) << 16) | \
static_cast<int>(minor))
#define GR_GLSL_VER(major, minor) ((static_cast<int>(major) << 16) | \
static_cast<int>(minor))
////////////////////////////////////////////////////////////////////////////////
/**
* Some drivers want the var-int arg to be zero-initialized on input.
*/
#define GR_GL_INIT_ZERO 0
#define GR_GL_GetIntegerv(gl, e, p) \
do { \
*(p) = GR_GL_INIT_ZERO; \
GR_GL_CALL(gl, GetIntegerv(e, p)); \
} while (0)
#define GR_GL_GetFramebufferAttachmentParameteriv(gl, t, a, pname, p) \
do { \
*(p) = GR_GL_INIT_ZERO; \
GR_GL_CALL(gl, GetFramebufferAttachmentParameteriv(t, a, pname, p)); \
} while (0)
#define GR_GL_GetRenderbufferParameteriv(gl, t, pname, p) \
do { \
*(p) = GR_GL_INIT_ZERO; \
GR_GL_CALL(gl, GetRenderbufferParameteriv(t, pname, p)); \
} while (0)
#define GR_GL_GetTexLevelParameteriv(gl, t, l, pname, p) \
do { \
*(p) = GR_GL_INIT_ZERO; \
GR_GL_CALL(gl, GetTexLevelParameteriv(t, l, pname, p)); \
} while (0)
////////////////////////////////////////////////////////////////////////////////
/**
* Helpers for glGetString()
*/
// these variants assume caller already has a string from glGetString()
GrGLVersion GrGLGetVersionFromString(const char* versionString);
GrGLBinding GrGLGetBindingInUseFromString(const char* versionString);
GrGLSLVersion GrGLGetGLSLVersionFromString(const char* versionString);
bool GrGLHasExtensionFromString(const char* ext, const char* extensionString);
// these variants call glGetString()
bool GrGLHasExtension(const GrGLInterface*, const char* ext);
GrGLBinding GrGLGetBindingInUse(const GrGLInterface*);
GrGLVersion GrGLGetVersion(const GrGLInterface*);
GrGLSLVersion GrGLGetGLSLVersion(const GrGLInterface*);
/**
* Helpers for glGetError()
*/
void GrGLCheckErr(const GrGLInterface* gl,
const char* location,
const char* call);
void GrGLClearErr(const GrGLInterface* gl);
////////////////////////////////////////////////////////////////////////////////
/**
* Macros for using GrGLInterface to make GL calls
*/
// internal macro to conditionally call glGetError based on compile-time and
// run-time flags.
#if GR_GL_CHECK_ERROR
extern bool gCheckErrorGL;
#define GR_GL_CHECK_ERROR_IMPL(IFACE, X) \
if (gCheckErrorGL) \
GrGLCheckErr(IFACE, GR_FILE_AND_LINE_STR, #X)
#else
#define GR_GL_CHECK_ERROR_IMPL(IFACE, X)
#endif
// internal macro to conditionally log the gl call using GrPrintf based on
// compile-time and run-time flags.
#if GR_GL_LOG_CALLS
extern bool gLogCallsGL;
#define GR_GL_LOG_CALLS_IMPL(X) \
if (gLogCallsGL) \
GrPrintf(GR_FILE_AND_LINE_STR "GL: " #X "\n")
#else
#define GR_GL_LOG_CALLS_IMPL(X)
#endif
// internal macro that does the per-GL-call callback (if necessary)
#if GR_GL_PER_GL_FUNC_CALLBACK
#define GR_GL_CALLBACK_IMPL(IFACE) (IFACE)->fCallback(IFACE)
#else
#define GR_GL_CALLBACK_IMPL(IFACE)
#endif
// makes a GL call on the interface and does any error checking and logging
#define GR_GL_CALL(IFACE, X) \
do { \
GR_GL_CALL_NOERRCHECK(IFACE, X); \
GR_GL_CHECK_ERROR_IMPL(IFACE, X); \
} while (false)
// Variant of above that always skips the error check. This is useful when
// the caller wants to do its own glGetError() call and examine the error value.
#define GR_GL_CALL_NOERRCHECK(IFACE, X) \
do { \
GR_GL_CALLBACK_IMPL(IFACE); \
(IFACE)->f##X; \
GR_GL_LOG_CALLS_IMPL(X); \
} while (false)
// same as GR_GL_CALL but stores the return value of the gl call in RET
#define GR_GL_CALL_RET(IFACE, RET, X) \
do { \
GR_GL_CALL_RET_NOERRCHECK(IFACE, RET, X); \
GR_GL_CHECK_ERROR_IMPL(IFACE, X); \
} while (false)
// same as GR_GL_CALL_RET but always skips the error check.
#define GR_GL_CALL_RET_NOERRCHECK(IFACE, RET, X) \
do { \
GR_GL_CALLBACK_IMPL(IFACE); \
(RET) = (IFACE)->f##X; \
GR_GL_LOG_CALLS_IMPL(X); \
} while (false)
// call glGetError without doing a redundant error check or logging.
#define GR_GL_GET_ERROR(IFACE) (IFACE)->fGetError()
#endif
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