opengl

commit 633aaf0ca205d94558f4231bc3f5874ada89f21a
parent f76ada37bb1470a7c15a1f56f0b83accead0097a
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Sun, 25 Jun 2023 14:51:48 +0900

add color

Diffstat:
M
main.c
 | 
25
+++++++++++++------------

1 file changed, 13 insertions(+), 12 deletions(-)
diff --git a/main.c b/main.c
@@ -6,10 +6,10 @@
 #include <GLFW/glfw3.h>
 
 float vertices[] = {
-	0.5, 0.5, 0.0,
-	0.5, -0.5, -0.0,
-	-0.5, -0.5, 0.0,
-	-0.5, 0.5, 0.0,
+	0.5, 0.5, 0.0,   1.0, 0.0, 0.0,
+	0.5, -0.5, -0.0, 0.0, 1.0, 0.0,
+	-0.5, -0.5, 0.0, 0.0, 0.0, 1.0,
+	-0.5, 0.5, 0.0,  0.0, 1.0, 1.0,
 };
 
 unsigned int indices[] = {
@@ -20,23 +20,26 @@ unsigned int indices[] = {
 const char *vertexShaderSource = "
 	#version 330 core
 	layout (location = 0) in vec3 aPos;
+	layout (location = 1) in vec3 aColor;
+	out vec3 ourColor;
 	
 	void
 	main()
 	{
 		gl_Position = vec4(aPos, 1.0);
+		ourColor = aColor;
 	}
 ";
 
 const char *fragmentShaderSource = "
 	#version 330 core
-	uniform vec4 ourColor;
+	in vec3 ourColor;
 	out vec4 FragColor;
 	
 	void
 	main()
 	{
-		FragColor = ourColor;
+		FragColor = vec4(ourColor, 1.0);
 	}
 ";
 
@@ -127,9 +130,12 @@ main(void)
 	glBindVertexArray(VAO);
 	glBindBuffer(GL_ARRAY_BUFFER, VBO);
 	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
-	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3*sizeof(float),
+	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);
 	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
 	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices,
 		GL_STATIC_DRAW);
@@ -140,11 +146,6 @@ main(void)
 		glClearColor(1.0, 1.0, 0.8, 1.0);
 		glClear(GL_COLOR_BUFFER_BIT);
 		
-		float timeValue = glfwGetTime();
-		float greenValue = sinf(timeValue) / 2.0 + 0.5;
-		int vertexColorLocation =
-			glGetUniformLocation(shaderProgram, "ourColor");
-		glUniform4f(vertexColorLocation, 0.0, greenValue, 0.0, 1.0);
 		glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
 	
 		glfwPollEvents();