port from perforce

uc16-4k/Shaders.cpp

@@ -0,0 +1,119 @@
+#include "Shaders.h"
+
+#ifdef _DEBUG
+
+#include <gl/GLU.h>
+
+PFNGLCREATESHADERPROGRAMEXTPROC glCreateShaderProgram = NULL;
+PFNGLGETPROGRAMIVPROC glGetProgramiv = NULL;
+PFNGLUSEPROGRAMPROC glUseProgram = NULL;
+PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog = NULL;
+
+void useProgram(GLhandleARB ah_Program)
+{
+	glUseProgram(ah_Program);
+}
+
+void initShaders()
+{
+	glGetProgramiv = (PFNGLGETPROGRAMIVPROC)myGetProcAddress("glGetProgramiv");
+	glUseProgram = (PFNGLUSEPROGRAMPROC)myGetProcAddress("glUseProgram");
+	glGetProgramInfoLog = (PFNGLGETPROGRAMINFOLOGPROC)myGetProcAddress("glGetProgramInfoLog");
+	glCreateShaderProgram = (PFNGLCREATESHADERPROGRAMEXTPROC)myGetProcAddress("glCreateShaderProgramEXT");
+	
+	if (!(glCreateShaderProgram && glGetProgramiv && glUseProgram && glGetProgramInfoLog))
+	{
+		std::cerr <<  "Some shader functions are not available!" << std::endl;
+	}
+}
+
+void PrintErrors()
+{
+	GLenum lr_Error = GL_NO_ERROR;
+	int li_ErrorCount = 5;
+	do
+	{
+		lr_Error = glGetError();
+		if (lr_Error != GL_NO_ERROR)
+		{
+			li_ErrorCount--;
+			char* ls_ErrorString = (char*)gluErrorString(lr_Error);
+			if (ls_ErrorString != 0)
+				std::cout << "OPENGL :: ERROR " << ls_ErrorString << std::endl;
+		}
+		if (li_ErrorCount == 0)
+		{
+			std::cout << "OPENGL :: ERROR Too many errors!" << std::endl;
+			break;
+		}
+	} while (lr_Error != GL_NO_ERROR);
+}
+
+GLhandleARB createFragmentProgram(const char* as_FileName)
+{
+	GLhandleARB lh_Program = 0;
+
+	char* ls_ShaderSource = textFileRead(as_FileName);
+	if (ls_ShaderSource == NULL)
+	{
+		std::cerr << "Error reading file: " << as_FileName << std::endl;
+		return lh_Program;
+	}
+
+	lh_Program = glCreateShaderProgram(GL_FRAGMENT_SHADER, ls_ShaderSource);
+	printProgramInfoLog(lh_Program);
+
+	return lh_Program;
+}
+
+
+char* textFileRead(const char* as_FileName) 
+{
+	FILE* lh_File;
+	char* ls_Content = NULL;
+	size_t li_Count = 0;
+
+	if (as_FileName != NULL) 
+	{
+		fopen_s(&lh_File, as_FileName, "rt");
+
+		if (lh_File != NULL) 
+		{
+			fseek(lh_File, 0, SEEK_END);
+			li_Count = ftell(lh_File);
+			rewind(lh_File);
+
+			if (li_Count > 0) 
+			{
+				ls_Content = (char*) malloc(sizeof(char) * (li_Count + 1));
+				li_Count = fread(ls_Content, sizeof(char), li_Count, lh_File);
+				ls_Content[li_Count] = '\0';
+			}
+
+			fclose(lh_File);
+		}
+	}
+
+	return ls_Content;
+}
+
+void printProgramInfoLog(GLhandleARB ah_Program)
+{
+	int li_InfologLength = 0;
+	int li_CharsWritten = 0;
+	char* ls_InfoLog;
+
+	glGetProgramiv(ah_Program, GL_INFO_LOG_LENGTH, &li_InfologLength);
+
+	if (li_InfologLength > 0)
+	{
+		ls_InfoLog = (char *)malloc(li_InfologLength);
+
+		glGetProgramInfoLog(ah_Program, li_InfologLength, &li_CharsWritten, ls_InfoLog);
+
+		std::cerr << ls_InfoLog << std::endl;
+		free(ls_InfoLog);
+	}
+}
+
+#endif