Hello Triangle

fuck you triangle i hate you

4 files changed, 104 insertions, 1 deletions

diff --git a/Tupfile b/Tupfile
index 1fa5aa1..3ade1a2 100644
--- a/Tupfile
+++ b/Tupfile
@@ -4,5 +4,7 @@ CFLAGS  = -std=c99 -Wall -Wextra -Iglad
 LDFLAGS = -lGL -lglfw
 
 .gitignore
-: foreach src/*.c glad/*.c |> $(CC) $(CFLAGS) -c -o %o %f |> build/%B.o
+: foreach src/*.glsl |> cembed -z -s %f >%o |> build/src/embed_%B.c
+: foreach src/*.c |> cp %f %o |> build/%f
+: foreach build/src/*.c glad/*.c |> $(CC) $(CFLAGS) -c -o %o %f |> build/%B.o
 : build/*.o |> $(LD) -o %o %f $(LDFLAGS) |> build/gl
diff --git a/src/fragment.glsl b/src/fragment.glsl
new file mode 100644
index 0000000..ca4fb1f
--- /dev/null
+++ b/src/fragment.glsl
@@ -0,0 +1,8 @@
+#version 330 core
+out vec4 FragColor;
+
+void
+main()
+{
+	FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);
+}
diff --git a/src/main.c b/src/main.c
index bdb349c..4add491 100644
--- a/src/main.c
+++ b/src/main.c
@@ -3,6 +3,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+extern unsigned char src_vertex_glsl[];
+extern unsigned char src_fragment_glsl[];
+
 static void framebuffer_size_callback(GLFWwindow *window, int w, int h);
 
 int
@@ -36,7 +39,89 @@ main([[maybe_unused]] int argc, [[maybe_unused]] char **argv)
 	glViewport(0, 0, 800, 600);
 	glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
 
+	static const float verts[] = {
+		 0.5f,  0.5f, 0.0f, // top right
+		 0.5f, -0.5f, 0.0f, // bottom right
+		-0.5f, -0.5f, 0.0f, // bottom left
+		-0.5f,  0.5f, 0.0f  // top left
+	};
+	static const GLuint indices[] = {
+		0, 1, 3, // first triangle
+		1, 2, 3  // second triangle
+	};
+	GLuint VBO;
+	glGenBuffers(1, &VBO);
+
+	const GLuint vertex_shader = glCreateShader(GL_VERTEX_SHADER);
+	if (vertex_shader == 0) {
+		fprintf(stderr, "glCreateShader failed\n");
+		return 1;
+	}
+	const char *const vertex_source = (const char*)src_vertex_glsl;
+	glShaderSource(vertex_shader, 1, &vertex_source, NULL);
+	glCompileShader(vertex_shader);
+	int success;
+	glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &success);
+	if (!success) {
+		char info_log[512];
+		glGetShaderInfoLog(vertex_shader, 512, NULL, info_log);
+		fprintf(stderr, "glCompileShader failed:\n%s\n", info_log);
+		return 1;
+	}
+
+	const GLuint fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
+	if (fragment_shader == 0) {
+		fprintf(stderr, "glCreateShader failed\n");
+		return 1;
+	}
+	const char *const fragment_source = (const char*)src_fragment_glsl;
+	glShaderSource(fragment_shader, 1, &fragment_source, NULL);
+	glCompileShader(fragment_shader);
+	glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &success);
+	if (!success) {
+		char info_log[512];
+		glGetShaderInfoLog(fragment_shader, 512, NULL, info_log);
+		fprintf(stderr, "glCompileShader failed:\n%s\n", info_log);
+		return 1;
+	}
+
+	const GLuint shader_program = glCreateProgram();
+	if (shader_program == 0) {
+		fprintf(stderr, "glCreateProgram failed\n");
+		return 1;
+	}
+	glAttachShader(shader_program, vertex_shader);
+	glAttachShader(shader_program, fragment_shader);
+	glLinkProgram(shader_program);
+	glDeleteShader(vertex_shader);
+	glDeleteShader(fragment_shader);
+	glGetProgramiv(shader_program, GL_LINK_STATUS, &success);
+	if (!success) {
+		char info_log[512];
+		glGetProgramInfoLog(shader_program, 512, NULL, info_log);
+		fprintf(stderr, "glLinkProgram failed:\n%s\n", info_log);
+		return 1;
+	}
+
+	GLuint EBO;
+	glGenBuffers(1, &EBO);
+
+	GLuint VAO;
+	glGenVertexArrays(1, &VAO);
+	glBindVertexArray(VAO);
+	glBindBuffer(GL_ARRAY_BUFFER, VBO);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STATIC_DRAW);
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), NULL);
+	glEnableVertexAttribArray(0);
+
+	glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 	while (!glfwWindowShouldClose(window)) {
+		glUseProgram(shader_program);
+		glBindVertexArray(VAO);
+		glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+
 		glfwSwapBuffers(window);
 		glfwPollEvents();
 	}
diff --git a/src/vertex.glsl b/src/vertex.glsl
new file mode 100644
index 0000000..2ad10d2
--- /dev/null
+++ b/src/vertex.glsl
@@ -0,0 +1,8 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+
+void
+main()
+{
+	gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
+}