basic bezier path system added

1 files changed, 170 insertions, 0 deletions

diff --git a/gl_calls.cpp b/gl_calls.cpp
new file mode 100644
index 0000000..85ce0b3
--- /dev/null
+++ b/gl_calls.cpp
@@ -0,0 +1,170 @@
+const char *vertexShaderSource = "#version 330 core\n"
+"layout (location = 0) in vec3 aPos;\n"
+"layout (location = 1) in vec2 aTexCoord;\n"
+"out vec2 TexCoord;\n"
+"void main()\n"
+"{\n"
+" gl_Position = vec4(aPos, 1.0);\n"
+" TexCoord = aTexCoord;\n"
+"}\0";
+
+#if 0
+const char *fragmentShaderSource = "#version 330 core\n"
+"out vec4 FragColor;\n"
+"in vec2 TexCoord;\n"
+"uniform float Start;\n"
+"uniform float Mid;\n"
+"uniform float End;\n"
+"uniform vec4 StartCol;\n"
+"uniform vec4 MidCol;\n"
+"uniform vec4 EndCol;\n"
+"uniform sampler2D ourTexture;\n"
+"void main()\n"
+"{\n"
+"vec4 OutCol = texture(ourTexture, TexCoord);\n"
+// individual channels
+"vec4 ColorI = pow(OutCol, MidCol);\n"
+"vec4 ValI = 1.0f / (EndCol - StartCol) * (ColorI - StartCol);\n"
+// global channel
+"vec4 ColorG = pow(ValI, vec4(Mid));\n"
+"vec4 ValG = 1.0f / (End - Start) * (ColorG - Start);\n"
+"FragColor = clamp(ValG, 0.0f, 1.0f);\n"
+"}\0";
+#else
+const char *fragmentShaderSource = "#version 330 core\n"
+"uniform float Radius;\n"
+"uniform vec2 Direction;\n"
+"uniform sampler2D ourTexture;\n"
+"out vec4 FragColor;\n"
+"in vec2 TexCoord;\n"
+"\n"
+"vec4 blur(sampler2D image, vec2 uv, vec2 resolution, vec2 direction) {\n"
+"    vec4 color = vec4(0.0f);\n"
+"    float Omega = Radius / 3;\n"
+"    float Divisor = 2*Omega*Omega;\n"
+"    float A2 = 1.0f / (Omega * sqrt(2*3.141592));\n"
+"    for (float Span = -round(Radius); Span < round(Radius); Span++) {\n"
+"        float Dividend = -Span * Span;\n"
+"        float Multiplier =  A2 * exp(Dividend/Divisor);\n"
+"        vec2 Dir = Span*direction;\n"
+"        color += texture2D(image, uv + (Dir / resolution)) * Multiplier;\n"
+"    }\n"
+"    return color;\n"
+"}\n"
+"void main(void) {\n"
+"    gl_FragColor = blur(ourTexture, TexCoord, vec2(1280, 720),  Direction);\n"
+"}\0";
+#endif
+
+
+static void TestGL_InitShader() {
+    TGL.VertexShader = glCreateShader(GL_VERTEX_SHADER);
+
+    // We have to compile our shaders before executing them.
+    glShaderSource(TGL.VertexShader, 1, &vertexShaderSource, NULL);
+    glCompileShader(TGL.VertexShader);
+
+    int success;
+    char infoLog[512];
+    glGetShaderiv(TGL.VertexShader, GL_COMPILE_STATUS, &success);
+
+    if(!success)
+    {
+        glGetShaderInfoLog(TGL.VertexShader, 512, NULL, infoLog);
+        printf("Vertex shader fail:\n %s", infoLog);
+    }
+
+    TGL.FragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
+
+    glShaderSource(TGL.FragmentShader, 1, &fragmentShaderSource, NULL);
+    glCompileShader(TGL.FragmentShader);
+
+    glGetShaderiv(TGL.FragmentShader, GL_COMPILE_STATUS, &success);
+
+    if(!success)
+    {
+        glGetShaderInfoLog(TGL.FragmentShader, 512, NULL, infoLog);
+        printf("Fragment shader fail:\n %s", infoLog);
+    }
+
+    // Shader programs link both types of shaders together.
+    TGL.ShaderProgram = glCreateProgram();
+
+    glAttachShader(TGL.ShaderProgram, TGL.VertexShader);
+    glAttachShader(TGL.ShaderProgram, TGL.FragmentShader);
+    glLinkProgram(TGL.ShaderProgram);
+
+    glGetProgramiv(TGL.ShaderProgram, GL_LINK_STATUS, &success);
+    if(!success) {
+        glGetProgramInfoLog(TGL.ShaderProgram, 512, NULL, infoLog);
+        printf("Shader linkage fail:\n %s", infoLog);
+    }
+
+    // The shaders are no longer needed by anything once they're linked.
+    glDeleteShader(TGL.VertexShader);
+    glDeleteShader(TGL.FragmentShader);
+
+}
+
+static void TestGL_InitVerts() {
+
+    float GLVertices[] = {
+         1.0f,  1.0f, 0.0f, 1.0f, 1.0f,
+         1.0f, -1.0f, 0.0f, 1.0f, 0.0f,
+        -1.0f, -1.0f, 0.0f, 0.0f, 0.0f,
+        -1.0f,  1.0f, 0.0f, 0.0f, 1.0f,
+    };
+    unsigned int GLIndices[] = {
+        0, 1, 3,
+        1, 2, 3
+    };
+
+    // Indices!
+    glGenBuffers(1, &TGL.EBO);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, TGL.EBO);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(GLIndices), GLIndices,
+                 GL_STATIC_DRAW);
+    glGenBuffers(1, &TGL.VBO);
+
+    // Our vertices need to be stored in this buffer.
+    glBindBuffer(GL_ARRAY_BUFFER, TGL.VBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(GLVertices), GLVertices, GL_STATIC_DRAW);
+
+    // position attribute
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
+    glEnableVertexAttribArray(0);
+    // texture coordinate (note the last parameter's offset)
+    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
+    glEnableVertexAttribArray(1);
+}
+
+void
+TestGL_InitTexture(gl_effect_layer *Test, void *Data, uint16 Width, uint16 Height)
+{
+    glGenTextures(1, &Test->Texture);
+    glBindTexture(GL_TEXTURE_2D, Test->Texture);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+    glViewport(0, 0, Width, Height);
+
+    glGenFramebuffers(1, &Test->FBO);
+    glGenRenderbuffers(1, &Test->RBO);
+
+    glBindRenderbuffer(GL_RENDERBUFFER, Test->RBO);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, Width, Height);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, Test->FBO);
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, Test->RBO);
+
+    // Non-POT textures with RGB instead of RGBA doesn't seem to work, but
+    // since I don't plan on storing bitmaps that way (AVX2 is much more
+    // efficient with RGBA) it doesn't really matter.
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, Width, Height, 0, GL_RGBA,
+                 GL_UNSIGNED_BYTE, Data);
+    // glGenerateMipmap(GL_TEXTURE_2D);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}