Add gl_strerror implementation

gl_strerror takes an OpenGL error enum and acts like strerror.

4 files changed, 27 insertions, 0 deletions

diff --git a/gldefs.h b/gldefs.h
index 429b85d..cb2a87d 100644
--- a/gldefs.h
+++ b/gldefs.h
@@ -32,10 +32,19 @@ typedef double GLdouble;
 typedef double GLclampd;
 
 enum {
+	GL_NO_ERROR = 0,
 	GL_FALSE = 0,
 	GL_TRUE = 1,
 	GL_TRIANGLES = 0x0004,
 	GL_FRONT_AND_BACK = 0x0408,
+	GL_INVALID_ENUM = 0x0500,
+	GL_INVALID_VALUE = 0x0501,
+	GL_INVALID_OPERATION = 0x0502,
+	GL_STACK_OVERFLOW = 0x0503,
+	GL_STACK_UNDERFLOW = 0x0504,
+	GL_OUT_OF_MEMORY = 0x0505,
+	GL_INVALID_FRAMEBUFFER_OPERATION = 0x0506,
+	GL_CONTEXT_LOST = 0x0507,
 	GL_UNSIGNED_INT = 0x1405,
 	GL_FLOAT = 0x1406,
 	GL_LINE = 0x1B01,
diff --git a/loadgl.c.in b/loadgl.c.in
index a76eebc..1959b64 100644
--- a/loadgl.c.in
+++ b/loadgl.c.in
@@ -46,3 +46,19 @@ const char *lgl_strerror(enum lgl_status status)
 	}
 	return "Unknown";
 }
+
+const char *gl_strerror(GLenum error)
+{
+	switch (error) {
+	case GL_NO_ERROR: return "No error";
+	case GL_INVALID_ENUM: return "Invalid enumeration";
+	case GL_INVALID_VALUE: return "Invalid value";
+	case GL_INVALID_OPERATION: return "Invalid operation";
+	case GL_STACK_OVERFLOW: return "Stack overflow";
+	case GL_STACK_UNDERFLOW: return "Stack underflow";
+	case GL_OUT_OF_MEMORY: return "Out of memory";
+	case GL_INVALID_FRAMEBUFFER_OPERATION: return "Invalid framebuffer operation";
+	case GL_CONTEXT_LOST: return "Context lost";
+	}
+	return "Unknown";
+}
diff --git a/loadgl.h.in b/loadgl.h.in
index e7381cd..e741d5e 100644
--- a/loadgl.h.in
+++ b/loadgl.h.in
@@ -16,6 +16,7 @@ enum lgl_status {
 
 enum lgl_status lgl_load(lgl_loadfunc *load);
 const char *lgl_strerror(enum lgl_status status);
+const char *gl_strerror(GLenum error);
 
 #define _LGL_INTERFACE(rett, name, func, ...)	\
 	typedef rett func(__VA_ARGS__);		\
diff --git a/loadgl.m4 b/loadgl.m4
index 3a20e7c..8dd0316 100644
--- a/loadgl.m4
+++ b/loadgl.m4
@@ -21,6 +21,7 @@ define(`LOADS', `undivert(3)')
 
 # Functions
 
+LOAD(glGetError, GLenum, gl_error, void)
 LOAD(glViewport, void, gl_viewport, GLint x, GLint y, GLsizei width, GLsizei height)
 LOAD(glClearColor, void, gl_clearcolor, GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha)
 LOAD(glClear, void, gl_clear, GLbitfield mask)