--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/shader.c Wed Nov 08 23:17:07 2023 +0100
@@ -0,0 +1,139 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ * Copyright 2023 Mike Becker. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ascension/shader.h"
+#include "ascension/files.h"
+#include "ascension/error.h"
+
+#include <GL/glew.h>
+
+AscShaderProgram ASC_SHADER_FONT;
+
+
+AscShader asc_shader_compile(unsigned int type,
+ char const *code,
+ int length) {
+ GLuint id = glCreateShader(type);
+ if (id == 0) {
+ asc_error("glCreateShader failed");
+ return (AscShader) {0};
+ }
+
+ GLint success;
+ glShaderSource(id, 1, &code, &length);
+ glCompileShader(id);
+ glGetShaderiv(id, GL_COMPILE_STATUS, &success);
+ if (success) {
+ asc_dprintf("Shader %u compiled", id);
+ return (AscShader) {id};
+ } else {
+ char *log = malloc(1024);
+ glGetShaderInfoLog(id, 1024, NULL, log);
+ glDeleteShader(id);
+ asc_error(log);
+ free(log);
+ return (AscShader) {0};
+ }
+}
+
+AscShader asc_shader_compilef(unsigned int type,
+ char const *filename) {
+ asc_file code = asc_file_mmap_rdonly(filename);
+ if (code.ptr == NULL) {
+ asc_error("Mapping shader file into memory failed");
+ return (AscShader) {0};
+ }
+ AscShader ret = asc_shader_compile(type, code.ptr, code.length);
+ asc_file_unmap(code);
+ return ret;
+}
+
+AscShaderProgram asc_shader_link(AscShader vertex,
+ AscShader fragment) {
+ if (vertex.id == 0 || fragment.id == 0) {
+ asc_dprintf("Skip linking shader program - shaders have not been loaded correctly.");
+ return (AscShaderProgram) {0};
+ }
+
+ GLint success;
+ GLint id = glCreateProgram();
+ if (id <= 0) {
+ asc_error("glCreateProgram failed");
+ return (AscShaderProgram) {0};
+ }
+ glAttachShader(id, vertex.id);
+ glAttachShader(id, fragment.id);
+ glLinkProgram(id);
+ glGetProgramiv(id, GL_LINK_STATUS, &success);
+ glDetachShader(id, vertex.id);
+ glDetachShader(id, fragment.id);
+ if (success) {
+ asc_dprintf("Shader Program %u linked (vtf: %u, frag: %u)", id, vertex.id, fragment.id);
+ return (AscShaderProgram) {id};
+ } else {
+ char *log = malloc(1024);
+ glGetProgramInfoLog(id, 1024, NULL, log);
+ glDeleteShader(id);
+ asc_error(log);
+ free(log);
+ return (AscShaderProgram) {0};
+ }
+}
+
+void asc_shader_destroy(AscShader shader) {
+ if (shader.id > 0) {
+ asc_dprintf("Delete Shader %u", shader.id);
+ glDeleteShader(shader.id);
+ }
+ shader.id = 0;
+}
+
+void asc_shader_program_destroy(AscShaderProgram program) {
+ if (program.id > 0) {
+ asc_dprintf("Delete Shader Program %u", program.id);
+ glDeleteProgram(program.id);
+ }
+ program.id = 0;
+}
+
+static AscShaderProgram asc_shader_compile_link_discard(
+ char const *vtxName, char const *fragName) {
+ AscShader font_vtx = asc_shader_compilef(GL_VERTEX_SHADER, vtxName);
+ AscShader font_frag = asc_shader_compilef(GL_FRAGMENT_SHADER, fragName);
+ AscShaderProgram prog = asc_shader_link(font_vtx, font_frag);
+ asc_shader_destroy(font_vtx);
+ asc_shader_destroy(font_frag);
+ return prog;
+}
+
+void asc_shader_initialize_predefined(void) {
+ ASC_SHADER_FONT = asc_shader_compile_link_discard("shader/font_vtx.glsl", "shader/font_frag.glsl");
+}
+
+void asc_shader_destroy_predefined(void) {
+ asc_shader_program_destroy(ASC_SHADER_FONT);
+}
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