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Triangle not working

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Ben
2019-01-10 23:21:35 +00:00
parent 9fd302c683
commit 9ba94cb010
2 changed files with 17 additions and 18 deletions
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35
OpenGL/cube/src/main.cpp
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@@ -42,6 +42,7 @@ bool loadShader(std::string shaderSource, GLenum type, std::string shader) {
}
VertexShaders[shader] = vertexShader;
std::cout << "Vertex shader at '" << shader << "' compiled..." << std::endl;
} else if (type == GL_FRAGMENT_SHADER) {
GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &source, NULL);
@@ -57,6 +58,7 @@ bool loadShader(std::string shaderSource, GLenum type, std::string shader) {
}
FragmentShaders[shader] = fragmentShader;
std::cout << "Fragment shader at '" << shader << "' compiled..." << std::endl;
}
return true;
}
@@ -66,21 +68,13 @@ void makeShaderProgram(std::string vert, std::string frag, std::string program)
glAttachShader(shaderProgram, VertexShaders[vert]);
glAttachShader(shaderProgram, FragmentShaders[frag]);
ShaderPrograms[program] = shaderProgram;
}
void applySimpleShaders(std::string program) {
glBindFragDataLocation(ShaderPrograms[program], 0, "outColour");
GLint posAttrib = glGetAttribLocation(ShaderPrograms[program], "position");
glVertexAttribPointer(posAttrib, 2, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(posAttrib);
}
void linkShader(std::string shader) {
glLinkProgram(ShaderPrograms[shader]);
std::cout << "Shader program '" << program << "' created" << std::endl;
}
void applyShader(std::string shader) {
glLinkProgram(ShaderPrograms[shader]);
glUseProgram(ShaderPrograms[shader]);
std::cout << "Shader program '" << shader << "' applied" << std::endl;
}
int main(int argc, char** argv) {
@@ -137,13 +131,17 @@ int main(int argc, char** argv) {
glBufferData(GL_ARRAY_BUFFER, sizeof(verticies), verticies, GL_STATIC_DRAW);
// Load, compile, apply and link shader programs
if (!loadShader(readShader("shaders/simple.frag"), GL_FRAGMENT_SHADER, "simpleFrag") ||
!loadShader(readShader("shaders/simple.vert"), GL_VERTEX_SHADER , "simpleVert")) {
if (!loadShader(readShader("shaders/simple.vert"), GL_VERTEX_SHADER , "simpleVert") ||
!loadShader(readShader("shaders/simple.frag"), GL_FRAGMENT_SHADER, "simpleFrag")) {
return 0;
}
makeShaderProgram("simpleVert", "simpleFrag", "simpleProc");
applySimpleShaders("simpleProc");
linkShader("simpleProc");
glBindFragDataLocation(ShaderPrograms["simpleProc"], 0, "outColor");
applyShader("simpleProc");
GLint posAttrib = glGetAttribLocation(ShaderPrograms["simpleProc"], "position");
glVertexAttribPointer(posAttrib, 2, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(posAttrib);
SDL_Event event;
while (!game->isWindowClosed) {
@@ -153,10 +151,11 @@ int main(int argc, char** argv) {
game->isWindowClosed = true;
// Render
glClear(GL_COLOR_BUFFER_BIT);
applyShader("simpleProc");
glDrawArrays(GL_TRIANGLES, 0, 3);
// Clear the screen
glClear(GL_COLOR_BUFFER_BIT);
// Draw a triangle from the 3 vertices
glDrawArrays(GL_TRIANGLES, 0, 3);
// Swap buffers
SDL_GL_SwapWindow(game->window);
}