1 files changed, 119 insertions, 0 deletions
diff --git a/src/OpenGLSupport.cpp b/src/OpenGLSupport.cpp
new file mode 100644
index 0000000..0204835
--- /dev/null
+++ b/src/OpenGLSupport.cpp
@@ -0,0 +1,119 @@
+/*
+    Copyright 2016-2019 Arisotura
+
+    This file is part of melonDS.
+
+    melonDS is free software: you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation, either version 3 of the License, or (at your option)
+    any later version.
+
+    melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with melonDS. If not, see http://www.gnu.org/licenses/.
+*/
+
+#include "OpenGLSupport.h"
+
+
+DO_PROCLIST(DECLPROC);
+
+
+bool OpenGL_Init()
+{
+    DO_PROCLIST(LOADPROC);
+
+    return true;
+}
+
+bool OpenGL_BuildShaderProgram(const char* vs, const char* fs, GLuint* ids, const char* name)
+{
+    int len;
+    int res;
+
+    ids[0] = glCreateShader(GL_VERTEX_SHADER);
+    len = strlen(vs);
+    glShaderSource(ids[0], 1, &vs, &len);
+    glCompileShader(ids[0]);
+
+    glGetShaderiv(ids[0], GL_COMPILE_STATUS, &res);
+    if (res != GL_TRUE)
+    {
+        glGetShaderiv(ids[0], GL_INFO_LOG_LENGTH, &res);
+        if (res < 1) res = 1024;
+        char* log = new char[res+1];
+        glGetShaderInfoLog(ids[0], res+1, NULL, log);
+        printf("OpenGL: failed to compile vertex shader %s: %s\n", name, log);
+        printf("shader source:\n--\n%s\n--\n", vs);
+        delete[] log;
+
+        glDeleteShader(ids[0]);
+
+        return false;
+    }
+
+    ids[1] = glCreateShader(GL_FRAGMENT_SHADER);
+    len = strlen(fs);
+    glShaderSource(ids[1], 1, &fs, &len);
+    glCompileShader(ids[1]);
+
+    glGetShaderiv(ids[1], GL_COMPILE_STATUS, &res);
+    if (res != GL_TRUE)
+    {
+        glGetShaderiv(ids[1], GL_INFO_LOG_LENGTH, &res);
+        if (res < 1) res = 1024;
+        char* log = new char[res+1];
+        glGetShaderInfoLog(ids[1], res+1, NULL, log);
+        printf("OpenGL: failed to compile fragment shader %s: %s\n", name, log);
+        //printf("shader source:\n--\n%s\n--\n", fs);
+        delete[] log;
+
+        FILE* logf = fopen("shaderfail.log", "w");
+        fwrite(fs, len+1, 1, logf);
+        fclose(logf);
+
+        glDeleteShader(ids[0]);
+        glDeleteShader(ids[1]);
+
+        return false;
+    }
+
+    ids[2] = glCreateProgram();
+    glAttachShader(ids[2], ids[0]);
+    glAttachShader(ids[2], ids[1]);
+    glLinkProgram(ids[2]);
+
+    glGetProgramiv(ids[2], GL_LINK_STATUS, &res);
+    if (res != GL_TRUE)
+    {
+        glGetProgramiv(ids[2], GL_INFO_LOG_LENGTH, &res);
+        if (res < 1) res = 1024;
+        char* log = new char[res+1];
+        glGetProgramInfoLog(ids[2], res+1, NULL, log);
+        printf("OpenGL: failed to link program %s: %s\n", name, log);
+        delete[] log;
+
+        glDeleteShader(ids[0]);
+        glDeleteShader(ids[1]);
+        glDeleteProgram(ids[2]);
+
+        return false;
+    }
+
+    return true;
+}
+
+void OpenGL_DeleteShaderProgram(GLuint* ids)
+{
+    glDeleteShader(ids[0]);
+    glDeleteShader(ids[1]);
+    glDeleteProgram(ids[2]);
+}
+
+void OpenGL_UseShaderProgram(GLuint* ids)
+{
+    glUseProgram(ids[2]);
+}