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rgb tri

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This commit is contained in:
k 2024-12-19 17:29:25 -05:00
parent d79f49535e
commit 8cb5f8c773
2 changed files with 49 additions and 18 deletions
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30
headers/shapes.h
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@ -1,4 +1,10 @@
float tri_vertices[] = {-0.5f, -0.5f, 0.0f, 0.5f, -0.5f, 0.0f, 0.0f, 0.5f, 0.0f};
float tri_vertices[] = {-0.5f, -0.5f, 0.0f, 0.5f, -0.5f,
0.0f, 0.0f, 0.5f, 0.0f};
float tri_rgb_vertices[] = {
0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, /**/
-0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f, /**/
0.0f, 0.5f, 0.0f, 0.0f, 0.0f, 1.0f /**/
};
float sqr_vertices[] = {
0.5f, 0.5f, 0.0f, /*top R*/
@ -12,7 +18,8 @@ unsigned int sqr_indices[] = {
1, 2, 3 /*br triangle*/
};
const char *basicVertexShaderSource = "#version 330 core\n"
const char *basicVertexShaderSource =
"#version 330 core\n"
"layout (location = 0) in vec3 aPos;\n"
"out vec3 color;\n"
"void main()\n"
@ -28,3 +35,22 @@ const char *basicFragmentShaderSource = "#version 330 core\n"
"{\n"
" FragColor = (color/2+.5)*1.5;\n"
"}\n";
const char *rgbVertexShaderSource =
"#version 330 core\n"
"layout (location = 0) in vec3 aPos;\n"
"layout (location = 1) in vec3 aColor;\n"
"out vec3 color;\n"
"void main()\n"
"{\n"
" color = aColor;\n"
" gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
"}\0";
const char *rgbFragmentShaderSource = "#version 330 core\n"
"out vec4 FragColor;\n"
"in vec3 color;\n"
"void main()\n"
"{\n"
" FragColor = vec4(color, 1.0);\n"
"}\0";

13
src/main.cpp
View File

@ -39,17 +39,21 @@ int main(void) {
glGenBuffers(1, &VBO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(sqr_vertices), sqr_vertices,
glBufferData(GL_ARRAY_BUFFER, sizeof(tri_rgb_vertices), tri_rgb_vertices,
GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void *)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void *)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
/*
glGenBuffers(1, &EBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(sqr_indices), sqr_indices, GL_STATIC_DRAW);
*/
unsigned int shaderProgram =
shaderProgramCMPL(basicVertexShaderSource, basicFragmentShaderSource);
shaderProgramCMPL(rgbVertexShaderSource, rgbFragmentShaderSource);
glUseProgram(shaderProgram);
while (!glfwWindowShouldClose(window)) {
@ -61,7 +65,8 @@ int main(void) {
glUseProgram(shaderProgram);
glBindVertexArray(VAO);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
//glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
glDrawArrays(GL_TRIANGLES, 0, 3);
glfwSwapBuffers(window);
glfwPollEvents();