Add base structure for openGL playground

2020-03-17 23:25:23 +01:00
commit ec17d18154
9 changed files with 372 additions and 0 deletions
--- a/src/openglshader.cpp
+++ b/src/openglshader.cpp
@@ -0,0 +1,138 @@
+#include <opengl-playground/openglshader.hpp>
+
+OpenGlShaderProgram::OpenGlShaderProgram(std::string vertex_file, std::string geometry_file, std::string fragment_file)
+{
+	this->vertex_file = vertex_file;
+	this->geometry_file = geometry_file;
+	this->fragment_file = fragment_file;
+	this->compiled = false;
+}
+
+char *load_shader_program_from_file(std::string file_name)
+{
+	return NULL;
+}
+
+int OpenGlShaderProgram::compile()
+{
+	int ret_code = 0;
+	int success;
+	char info_log[512];
+	unsigned int vertex_shader, geometry_shader, fragment_shader;
+	bool vertex_b = false, geo_b = false, frag_b = false;
+	char *src_code;
+
+	if (this->compiled) {
+		glDeleteProgram(shader_program);
+		this->compiled = false;
+	}
+
+	this->shader_program = glCreateProgram();
+
+	if (!vertex_file.empty()) {
+		vertex_b = true;
+
+		/* Compile the vertex shader */
+		vertex_shader = glCreateShader(GL_VERTEX_SHADER);
+		glShaderSource(vertex_shader, 1, &src_code, NULL);
+
+		glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &success);
+		free(src_code);
+
+		if (!success) {
+			glGetShaderInfoLog(vertex_shader, 512, NULL, info_log);
+			fprintf(stderr, "%s\n", info_log);
+			ret_code = -1;
+			goto delete_vertex;
+		}
+
+		glAttachShader(this->shader_program, vertex_shader);
+	}
+
+	if (!this->geometry_file.empty()) {
+		geo_b = true;
+
+		/* Compile the vertex shader */
+		geometry_shader = glCreateShader(GL_VERTEX_SHADER);
+		glShaderSource(geometry_shader, 1, &src_code, NULL);
+
+		glGetShaderiv(geometry_shader, GL_COMPILE_STATUS, &success);
+		free(src_code);
+
+		if (!success) {
+			glGetShaderInfoLog(geometry_shader, 512, NULL, info_log);
+			fprintf(stderr, "%s\n", info_log);
+			ret_code = -1;
+			goto delete_geo;
+		}
+
+		glAttachShader(this->shader_program, geometry_shader);
+
+	}
+
+	if (!this->fragment_file.empty()) {
+		frag_b = true;
+
+		/* Compile the vertex shader */
+		fragment_shader = glCreateShader(GL_VERTEX_SHADER);
+		glShaderSource(fragment_shader, 1, &src_code, NULL);
+
+		glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &success);
+		free(src_code);
+
+		if (!success) {
+			glGetShaderInfoLog(fragment_shader, 512, NULL, info_log);
+			fprintf(stderr, "%s\n", info_log);
+			ret_code = -1;
+			goto delete_frag;
+		}
+
+		glAttachShader(this->shader_program, fragment_shader);
+	}
+
+	glLinkProgram(this->shader_program);
+
+	glGetShaderiv(this->shader_program, GL_LINK_STATUS, &success);
+	if (!success) {
+		glGetShaderInfoLog(this->shader_program, 512, NULL, info_log);
+		printf("%s\n", info_log);
+		ret_code = -2;
+	}
+
+	this->compiled = true;
+
+delete_frag:
+	if (frag_b)
+		glDeleteShader(fragment_shader);
+delete_geo:
+	if (geo_b)
+		glDeleteShader(geometry_shader);
+delete_vertex:
+	if (vertex_b)
+		glDeleteShader(vertex_shader);
+
+	if (ret_code) {
+		this->compiled = false;
+		glDeleteProgram(this->shader_program);
+		this->shader_program = 0;
+	}
+	return ret_code;
+}
+
+void OpenGlShaderProgram::unload()
+{
+	if (this->compiled) {
+		glDeleteProgram(this->shader_program);
+	}
+
+	this->compiled = false;
+}
+
+int OpenGlShaderProgram::use()
+{
+	if (!this->compiled)
+		return -1;
+
+	glUseProgram(this->shader_program);
+	return 0;
+}