initial

1 files changed, 65 insertions, 0 deletions

diff --git a/prge_shader.c b/prge_shader.c
new file mode 100644
index 0000000..21a91f3
--- /dev/null
+++ b/prge_shader.c
@@ -0,0 +1,65 @@
+U32 compile_shader(GLenum type, Str8 filename)
+{
+	Arena *tmp = arena_alloc(0);
+
+	Str8 src = str8_read_entire_file(tmp, filename);
+	if (!src.ptr || !src.length) {
+		str8print(str8_pushf(tmp, "[ERROR] : Failed to read \"%.*s\"\n", str8expand(filename)));
+		arena_release(tmp);
+		return 0;
+	}
+
+	const char *csrc = str8_to_cstr(tmp, src);
+
+	U32 id = glCreateShader(type);
+	glShaderSource(id, 1, &csrc, 0);
+	glCompileShader(id);
+
+	S32 status;
+	glGetShaderiv(id, GL_COMPILE_STATUS, &status);
+	if (status == GL_FALSE) {
+		char log[512];
+		glGetShaderInfoLog(id, 512, 0, log);
+		str8print(str8_pushf(tmp, "[ERROR] : Failed to compile : \"%.*s\"\n%s", str8expand(filename), log));
+	} else {
+		str8print(str8_pushf(tmp, "[INFO] : \"%.*s\" compiled successfully.\n", str8expand(filename)));
+	}
+
+	arena_release(tmp);
+
+	return id;
+}
+
+U32 create_shader_program(Str8 vert_filename, Str8 frag_filename)
+{
+	U32 vert = compile_shader(GL_VERTEX_SHADER, vert_filename);
+	U32 frag = compile_shader(GL_FRAGMENT_SHADER, frag_filename);
+
+	Arena *tmp = arena_alloc(0);
+
+	U32 id = glCreateProgram();
+	glAttachShader(id, vert);
+	glAttachShader(id, frag);
+	glLinkProgram(id);
+	S32 success;
+	glGetProgramiv(id, GL_LINK_STATUS, &success);
+	if (success == GL_FALSE) {
+		char log[512];
+		glGetProgramInfoLog(id, 512, 0, log);
+		str8print(str8_pushf(tmp, "[ERROR]: Failed to link shader program:\n%s", log));
+	} else {
+		str8print(str8_pushf(tmp, "[INFO]: Shader program linked successfuly.\n\n"));
+	}
+	glDeleteShader(vert);
+	glDeleteShader(frag);
+
+	arena_release(tmp);
+
+	return id;
+}
+
+void shader_set_mat4fv(U32 id, char *name, Mat4 m)
+{
+	S32 loc = glGetUniformLocation(id, name);
+	glUniformMatrix4fv(loc, 1, 0, (F32 *)&m);
+}