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#include <cstdio>
#include "../include/RenderBackend/OpenGL/opengl.hpp"
#include "../include/RenderBackend/OpenGL/VertexShader.hpp"
#include "../include/RenderBackend/OpenGL/PixelShader.hpp"
#include "../include/RenderBackend/OpenGL/ShaderProgram.hpp"
#include "../include/RenderBackend/OpenGL/DeviceMemory.hpp"
#include "../include/RenderBackend/OpenGL/DeviceFrame.hpp"
#include "../include/Triangle2D.hpp"
// TODO: Disallow shader variables that begin with "gl_" as reserved variables
// start with that. What about hlsl?
// TODO: Creating buffers etc should be somehow created/drawn using the window object, since they are associated with the window
// opengl context
using namespace amalgine;
using namespace std;
void glfwErrorHandler(int errorCode, const char *errorDescription);
void initGlfw();
void initGlew();
GLFWwindow *createWindow();
CompiledVertexShader* createVertexShader(const DeviceMemory &inputData);
CompiledPixelShader* createPixelShader();
int main()
{
initGlfw();
glfwSetErrorCallback(glfwErrorHandler);
GLFWwindow *window = createWindow();
DeviceFrame frame;
Triangle2D cpuTriangle(
Vertex2D(0.0f, 0.5f),
Vertex2D(0.5f, -0.5f),
Vertex2D(-0.5f, -0.5f)
);
DataView<Triangle2D> cpuTriangles(&cpuTriangle, 1);
DeviceMemory *gpuTriangle = frame.alloc();
gpuTriangle->copy(cpuTriangles, DeviceMemory::StorageType::STATIC);
CompiledVertexShader *vertexShader = createVertexShader(*gpuTriangle);
CompiledPixelShader *pixelShader = createPixelShader();
ShaderProgram shaderProgram;
shaderProgram.setVertexShader(vertexShader);
shaderProgram.setPixelShader(pixelShader);
// Make ShaderProgram.build return an object which we can do things on? since some operations
// require the shader to be built to be used
Result<bool> shaderBuildResult = shaderProgram.build();
ShaderProgramGlobalVec3 triangleColor = shaderProgram.getGlobalVec3("triangleColor");
triangleColor.set(1.0f, 0.0f, 0.0f);
if(!shaderBuildResult)
{
fprintf(stderr, "Failed to build shader program: %s\n", shaderBuildResult.getErrorMsg().c_str());
exit(20);
}
while(!glfwWindowShouldClose(window))
{
glfwPollEvents();
if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
// Set color for clearing
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
// Do the actual screen clearing, using the color set using glClearColor
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
shaderProgram.use();
frame.draw();
glfwSwapBuffers(window);
}
glfwTerminate();
return 0;
}
void glfwErrorHandler(int errorCode, const char *errorDescription)
{
printf("GLFW error code: %d, description: %s\n", errorCode, errorDescription);
}
void initGlfw()
{
if(!glfwInit())
{
fprintf(stderr, "Failed to initialize GLFW\n");
exit(-1);
}
glfwWindowHint(GLFW_SAMPLES, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 5);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
}
void initGlew()
{
glewExperimental = true;
if(glewInit() != GLEW_OK)
{
fprintf(stderr, "Failed to initialize GLEW\n");
glfwTerminate();
exit(-1);
}
}
GLFWwindow* createWindow()
{
GLFWwindow *window = glfwCreateWindow(1280, 720, "Amalgine", nullptr, nullptr);
if(!window)
{
fprintf(stderr, "Failed to open GLFW window\n");
glfwTerminate();
exit(10);
}
glfwSetInputMode(window, GLFW_STICKY_KEYS, GL_TRUE);
glfwMakeContextCurrent(window);
glfwSwapInterval(0);
initGlew();
return window;
}
CompiledVertexShader* createVertexShader(const DeviceMemory &inputData)
{
VertexShader vertexShader;
ShaderInputVec2 inputPosition = vertexShader.defineInputVec2("position");
inputPosition.setData(inputData);
vertexShader.defineMain([&inputPosition]()
{
return ShaderVec4(inputPosition, 0.0f, 1.0f);
});
Result<CompiledVertexShader*> compiledVertexShader = vertexShader.compile();
if(!compiledVertexShader)
{
fprintf(stderr, "Failed to compile vertex shader:\n%s", compiledVertexShader.getErrorMsg().c_str());
exit(2);
}
return compiledVertexShader.unwrap();
}
CompiledPixelShader* createPixelShader()
{
PixelShader pixelShader;
ShaderGlobalVec3 triangleColor = pixelShader.defineGlobalVec3("triangleColor");
ShaderOutputVec4 outColor = pixelShader.defineOutputVec4("outColor");
pixelShader.defineMain([&triangleColor, &outColor]()
{
outColor = ShaderVec4(triangleColor, 1.0f);
});
Result<CompiledPixelShader*> compiledPixelShader = pixelShader.compile();
if(!compiledPixelShader)
{
fprintf(stderr, "Failed to compile pixel shader:\n%s", compiledPixelShader.getErrorMsg().c_str());
exit(2);
}
return compiledPixelShader.unwrap();
}
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