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OpenGL Triangle Rendering Guide

The code defines vertex position data and generates and binds a buffer object to store it. It creates a shader program from vertex and fragment shader sources. In a render loop, it clears the screen, draws triangles using the shader and buffer data, and swaps buffers at each frame.

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62 views2 pages

OpenGL Triangle Rendering Guide

The code defines vertex position data and generates and binds a buffer object to store it. It creates a shader program from vertex and fragment shader sources. In a render loop, it clears the screen, draws triangles using the shader and buffer data, and swaps buffers at each frame.

Uploaded by

iDenis
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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unsigned int buffer;

glGenBuffers(1, &buffer);
glBindBuffer(GL_ARRAY_BUFFER, buffer);
glBufferData(GL_ARRAY_BUFFER, 6 * sizeof(float), positions, GL_STATIC_DRAW);

glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), 0);

ShaderProgramSource source = ParseShader("res/shaders/Basic.shader");


std::cout << source.VertexSource << std::endl;
std::cout << source.FragmentSource << std::endl;

unsigned int shader = CreateShader(source.VertexSource, source.FragmentSource);


glUseProgram(shader);

/* Loop until the user closes the window */


while (!glfwWindowShouldClose(window))
{
/* Render here */
glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);

/*
glBegin(GL_TRIANGLES);
glVertex2f(-0.5f, -0.5f);
glVertex2f( 0.0f, 0.5f);
glVertex2f( 0.5f, -0.5f);
glEnd();
*/
glDrawArrays(GL_TRIANGLES, 0, 3);

/* Swap front and back buffers */


glfwSwapBuffers(window);

/* Poll for and process events */


glfwPollEvents();
}

glDeleteProgram(shader);

glfwTerminate();
return 0;
}

float positions[] = {
0.0f, 0.5f,
-0.5f, -0.5f,
0.5f, -0.5f
};

unsigned int indices[] = {


0, 1, 3,
1, 2, 3
};
unsigned int buffer;
glGenBuffers(1, &buffer);
glBindBuffer(GL_ARRAY_BUFFER, buffer);
glBufferData(GL_ARRAY_BUFFER, 6 * sizeof(float), positions, GL_STATIC_DRAW);

glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), 0);

ShaderProgramSource source = ParseShader("res/shaders/Basic.shader");


std::cout << source.VertexSource << std::endl;
std::cout << source.FragmentSource << std::endl;

unsigned int shader = CreateShader(source.VertexSource, source.FragmentSource);


glUseProgram(shader);

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