1 files changed, 103 insertions, 0 deletions
diff --git a/src/effects_gl.cpp b/src/effects_gl.cpp
new file mode 100644
index 0000000..c3ff444
--- /dev/null
+++ b/src/effects_gl.cpp
@@ -0,0 +1,103 @@
+void GL_UpdateTexture(gl_effect_layer *Test, void *Data, uint16 Width, uint16 Height, uint16 BytesPerPixel, bool32 Multisample);
+static uint16 Effect_GL_InitShader(const char *Effect);
+static void GL_BindDefaultVertexArrays();
+
+void Effect_GL_Start(gl_effect_layer *Test, int Width, int Height, int BytesPerPixel, void *EffectBitmapAddress, uint16 ShaderProgram)
+{
+    GL_UpdateTexture(Test, EffectBitmapAddress, Width, Height, BytesPerPixel, 0);
+
+    GL_BindDefaultVertexArrays();
+
+    glUseProgram(ShaderProgram);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, Test->FramebufferObject);
+    glBindRenderbuffer(GL_RENDERBUFFER, Test->Color_Renderbuffer);
+
+    glBindTexture(GL_TEXTURE_2D, Test->Texture);
+    int ByteFlag = (BytesPerPixel == 4) ? GL_RGBA : GL_RGBA16;
+    int ByteFlag2 = (BytesPerPixel == 4) ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
+    glTexImage2D(GL_TEXTURE_2D, 0, ByteFlag, Width, Height, 0, GL_RGBA,
+                 ByteFlag2, EffectBitmapAddress);
+}
+
+void Effect_GL_DrawColor(int Width, int Height, int BytesPerPixel, void *EffectBitmapAddress,
+                         uint16 ShaderProgram, v4 Color)
+{
+    gl_effect_layer Test = {};
+
+    int ByteFlag = (BytesPerPixel == 4) ? GL_RGBA : GL_RGBA16;
+    int ByteFlag2 = (BytesPerPixel == 4) ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
+    Effect_GL_Start(&Test, Width, Height, BytesPerPixel, EffectBitmapAddress, ShaderProgram);
+
+    int Uniform = glGetUniformLocation(ShaderProgram, "Color");
+    glUniform4f(Uniform, Color.r, Color.g, Color.b, Color.a);
+
+    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+    glReadPixels(0, 0, Width, Height, GL_RGBA, ByteFlag2, EffectBitmapAddress);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    GL_DeleteHWBuffer(&Test);
+}
+
+void Effect_GL_GaussianBlur(int Width, int Height, int BytesPerPixel, void *EffectBitmapAddress,
+                            uint16 ShaderProgram, real32 Radius)
+{
+    gl_effect_layer Test = {};
+
+    int ByteFlag = (BytesPerPixel == 4) ? GL_RGBA : GL_RGBA16;
+    int ByteFlag2 = (BytesPerPixel == 4) ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
+    Effect_GL_Start(&Test, Width, Height, BytesPerPixel, EffectBitmapAddress, ShaderProgram);
+
+    // horizontal pass
+    int Uniform = glGetUniformLocation(ShaderProgram, "Radius");
+    glUniform1f(Uniform, Radius + 1.60f);
+    Uniform = glGetUniformLocation(ShaderProgram, "Direction");
+    glUniform2f(Uniform, 1.0f, 0.0f);
+
+    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+    glReadPixels(0, 0, Width, Height, GL_RGBA, ByteFlag2, EffectBitmapAddress);
+    //
+
+    // vertical pass
+    glTexImage2D(GL_TEXTURE_2D, 0, ByteFlag, Width, Height, 0, GL_RGBA,
+                 ByteFlag2, EffectBitmapAddress);
+
+    Radius = glGetUniformLocation(ShaderProgram, "Direction");
+    glUniform2f(Uniform, 0.0f, 1.0f);
+
+    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+    glReadPixels(0, 0, Width, Height, GL_RGBA, ByteFlag2, EffectBitmapAddress);
+    //
+
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    GL_DeleteHWBuffer(&Test);
+}
+
+void Effect_GL_Levels(int Width, int Height, int BytesPerPixel, void *EffectBitmapAddress,
+                         uint16 ShaderProgram, real32 Min, real32 Mid, real32 Max, v4 ColMin, v4 ColMid, v4 ColMax)
+{
+    gl_effect_layer Test = {};
+
+    int ByteFlag = (BytesPerPixel == 4) ? GL_RGBA : GL_RGBA16;
+    int ByteFlag2 = (BytesPerPixel == 4) ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
+    Effect_GL_Start(&Test, Width, Height, BytesPerPixel, EffectBitmapAddress, ShaderProgram);
+
+    int Uniform = glGetUniformLocation(ShaderProgram, "Start");
+    glUniform1f(Uniform, Min);
+    Uniform = glGetUniformLocation(ShaderProgram, "Mid");
+    glUniform1f(Uniform, Mid);
+    Uniform = glGetUniformLocation(ShaderProgram, "End");
+    glUniform1f(Uniform, Max);
+    Uniform = glGetUniformLocation(ShaderProgram, "StartCol");
+    glUniform4f(Uniform, ColMin.r, ColMin.g, ColMin.b,  ColMin.a);
+    Uniform = glGetUniformLocation(ShaderProgram, "MidCol");
+    glUniform4f(Uniform, ColMid.r, ColMid.g, ColMid.b,  ColMid.a);
+    Uniform = glGetUniformLocation(ShaderProgram, "EndCol");
+    glUniform4f(Uniform, ColMax.r, ColMax.g, ColMax.b,  ColMax.a);
+
+    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+    glReadPixels(0, 0, Width, Height, GL_RGBA, ByteFlag2, EffectBitmapAddress);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    GL_DeleteHWBuffer(&Test);
+}