1 files changed, 30 insertions, 1 deletions
diff --git a/effects_gl.cpp b/effects_gl.cpp
index 2b8eac1..c3ff444 100644
--- a/effects_gl.cpp
+++ b/effects_gl.cpp
@@ -21,7 +21,7 @@ void Effect_GL_Start(gl_effect_layer *Test, int Width, int Height, int BytesPerP
 }
 
 void Effect_GL_DrawColor(int Width, int Height, int BytesPerPixel, void *EffectBitmapAddress,
-                         uint16 ShaderProgram, v4 Color, blend_mode BlendMode)
+                         uint16 ShaderProgram, v4 Color)
 {
     gl_effect_layer Test = {};
 
@@ -72,3 +72,32 @@ void Effect_GL_GaussianBlur(int Width, int Height, int BytesPerPixel, void *Effe
     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);
+}