From 2e0e12140e95be18abf3cf7e54230ef22f410fbd Mon Sep 17 00:00:00 2001
From: Fox Caminiti <fox@foxcam.net>
Date: Tue, 23 Aug 2022 14:40:02 -0400
Subject: effects can use gl state

---
 effects_gl.cpp | 101 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 effects_gl.cpp

(limited to 'effects_gl.cpp')

diff --git a/effects_gl.cpp b/effects_gl.cpp
new file mode 100644
index 0000000..2c1435b
--- /dev/null
+++ b/effects_gl.cpp
@@ -0,0 +1,101 @@
+static uint16 Effect_GL_InitShader(int EffectIndex);
+static uint16 GL_EffectShaderProgram[512];
+static void GL_BindDefaultVertexArrays();
+static void GL_InitTexture(gl_effect_layer *Test);
+
+void Effect_GL_Levels(source *Source, layer_bitmap_info *BitmapInfo, memory *Memory, property_channel Property[])
+{
+    real32 All_Start = Property[0].CurrentValue.f;
+    real32 All_Mid = Property[1].CurrentValue.f;
+    real32 All_End = Property[2].CurrentValue.f;
+    v4 Start = Property[3].CurrentValue.col;
+    v4 Mid = Property[4].CurrentValue.col;
+    v4 End = Property[5].CurrentValue.col;
+
+    if (!BitmapInfo->Test.Initialized) {
+        GL_InitTexture(&BitmapInfo->Test);
+    }
+
+    gl_effect_layer Test = BitmapInfo->Test;
+    uint8 *Data = (uint8 *)BitmapInfo->BitmapBuffer;
+    uint16 Width = Source->Info.Width;
+    uint16 Height = Source->Info.Height;
+
+    glBindTexture(GL_TEXTURE_2D, Test.Texture);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, Width, Height, 0, GL_RGBA,
+                 GL_UNSIGNED_BYTE, Data);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, Test.FramebufferObject);
+    glBindRenderbuffer(GL_RENDERBUFFER, Test.Color_Renderbuffer);
+
+    uint16 ShaderProgram = Effect_GL_InitShader(1);
+
+    GL_BindDefaultVertexArrays();
+
+    int vertexColorLocation = glGetUniformLocation(ShaderProgram, "Start");
+    glUniform1f(vertexColorLocation, All_Start);
+    vertexColorLocation = glGetUniformLocation(ShaderProgram, "Mid");
+    glUniform1f(vertexColorLocation, All_Mid);
+    vertexColorLocation = glGetUniformLocation(ShaderProgram, "End");
+    glUniform1f(vertexColorLocation, All_End);
+    vertexColorLocation = glGetUniformLocation(ShaderProgram, "StartCol");
+    glUniform4f(vertexColorLocation, Start.r, Start.g, Start.b,  Start.a);
+    vertexColorLocation = glGetUniformLocation(ShaderProgram, "MidCol");
+    glUniform4f(vertexColorLocation, Mid.r, Mid.g, Mid.b,  Mid.a);
+    vertexColorLocation = glGetUniformLocation(ShaderProgram, "EndCol");
+    glUniform4f(vertexColorLocation, End.r, End.g, End.b,  End.a);
+
+    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+
+    glReadPixels(0, 0, Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, &Data[0]);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+}
+
+void Effect_GL_GaussianBlur(source *Source, layer_bitmap_info *BitmapInfo, memory *Memory, property_channel Property[])
+{
+    real32 Radius = Property[0].CurrentValue.f;
+
+    if (!BitmapInfo->Test.Initialized) {
+        GL_InitTexture(&BitmapInfo->Test);
+    }
+
+    gl_effect_layer Test = BitmapInfo->Test;
+    uint8 *Data = (uint8 *)BitmapInfo->BitmapBuffer;
+    uint16 Width = Source->Info.Width;
+    uint16 Height = Source->Info.Height;
+
+    glBindTexture(GL_TEXTURE_2D, Test.Texture);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, Width, Height, 0, GL_RGBA,
+                 GL_UNSIGNED_BYTE, Data);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, Test.FramebufferObject);
+    glBindRenderbuffer(GL_RENDERBUFFER, Test.Color_Renderbuffer);
+
+    uint16 ShaderProgram = Effect_GL_InitShader(2);
+
+    GL_BindDefaultVertexArrays();
+
+    int vertexColorLocation = glGetUniformLocation(ShaderProgram, "Radius");
+    glUniform1f(vertexColorLocation, Radius + 1.60f);
+    vertexColorLocation = glGetUniformLocation(ShaderProgram, "Direction");
+    glUniform2f(vertexColorLocation, 1.0f, 0.0f);
+
+    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+    glReadPixels(0, 0, Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, &Data[0]);
+
+    // This blur works in two passes.
+
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, Width, Height, 0, GL_RGBA,
+                 GL_UNSIGNED_BYTE, Data);
+
+    vertexColorLocation = glGetUniformLocation(ShaderProgram, "Direction");
+    glUniform2f(vertexColorLocation, 0.0f, 1.0f);
+
+    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+    glReadPixels(0, 0, Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, &Data[0]);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+}
-- 
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