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| author | Dan Goodliffe <dan@randomdan.homeip.net> | 2021-01-17 19:36:30 +0000 |
|---|---|---|
| committer | Dan Goodliffe <dan@randomdan.homeip.net> | 2021-01-17 22:16:48 +0000 |
| commit | 0bf4ad9e4a9e1c97e92aa23a365405dfef89bd7c (patch) | |
| tree | 68a80976a247836bbb1eecc835af437e3489fbb7 /gfx/gl/shader.cpp | |
| parent | First cut modernizing and sanitizing (diff) | |
| download | ilt-0bf4ad9e4a9e1c97e92aa23a365405dfef89bd7c.tar.bz2 ilt-0bf4ad9e4a9e1c97e92aa23a365405dfef89bd7c.tar.xz ilt-0bf4ad9e4a9e1c97e92aa23a365405dfef89bd7c.zip | |
Big reshuffle
Fixes code quality warnings now picked up.
Diffstat (limited to 'gfx/gl/shader.cpp')
| -rw-r--r-- | gfx/gl/shader.cpp | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/gfx/gl/shader.cpp b/gfx/gl/shader.cpp new file mode 100644 index 0000000..33fdf61 --- /dev/null +++ b/gfx/gl/shader.cpp @@ -0,0 +1,100 @@ +#include "shader.h"
+#include "transform.h"
+#include <gfx/gl/shaders/fs-basicShader.h>
+#include <gfx/gl/shaders/vs-basicShader.h>
+#include <glm/glm.hpp>
+#include <stdexcept>
+
+Shader::Shader(const std::string &) :
+ m_program {glCreateProgram()}, m_shaders {CreateShader(
+ (GLchar *)(basicShader_vs), basicShader_vs_len, GL_VERTEX_SHADER),
+ CreateShader(
+ (GLchar *)basicShader_fs, basicShader_fs_len, GL_FRAGMENT_SHADER)},
+ m_uniforms {}
+{
+ for (auto m_shader : m_shaders) {
+ glAttachShader(m_program, m_shader);
+ }
+
+ glBindAttribLocation(m_program, 0, "position");
+ glBindAttribLocation(m_program, 1, "texCoord");
+ glBindAttribLocation(m_program, 2, "normal");
+
+ glLinkProgram(m_program);
+ CheckShaderError(m_program, GL_LINK_STATUS, true, "Error linking shader program");
+
+ glValidateProgram(m_program);
+ CheckShaderError(m_program, GL_VALIDATE_STATUS, true, "Invalid shader program");
+
+ m_uniforms = {glGetUniformLocation(m_program, "MVP"), glGetUniformLocation(m_program, "Normal"),
+ glGetUniformLocation(m_program, "lightDirection")};
+}
+
+Shader::~Shader()
+{
+ for (auto m_shader : m_shaders) {
+ glDetachShader(m_program, m_shader);
+ glDeleteShader(m_shader);
+ }
+
+ glDeleteProgram(m_program);
+}
+
+void
+Shader::Bind() const
+{
+ glUseProgram(m_program);
+}
+
+void
+Shader::Update(const Transform & transform, const Camera & camera) const
+{
+ glm::mat4 MVP = transform.GetMVP(camera);
+ glm::mat4 Normal = transform.GetModel();
+
+ glUniformMatrix4fv(m_uniforms[0], 1, GL_FALSE, &MVP[0][0]);
+ glUniformMatrix4fv(m_uniforms[1], 1, GL_FALSE, &Normal[0][0]);
+ glUniform3f(m_uniforms[2], 0.0F, 0.0F, 1.0F);
+}
+
+void
+Shader::CheckShaderError(GLuint shader, GLuint flag, bool isProgram, const std::string & errorMessage)
+{
+ GLint success = 0;
+ std::array<GLchar, 1024> error {};
+
+ if (isProgram) {
+ glGetProgramiv(shader, flag, &success);
+ }
+ else {
+ glGetShaderiv(shader, flag, &success);
+ }
+
+ if (success == GL_FALSE) {
+ if (isProgram) {
+ glGetProgramInfoLog(shader, error.size(), nullptr, error.data());
+ }
+ else {
+ glGetShaderInfoLog(shader, error.size(), nullptr, error.data());
+ }
+
+ throw std::runtime_error {errorMessage + ": '" + std::string {error.data(), error.size()} + "'"};
+ }
+}
+
+GLuint
+Shader::CreateShader(const GLchar * text, GLint len, unsigned int type)
+{
+ GLuint shader = glCreateShader(type);
+
+ if (shader == 0) {
+ throw std::runtime_error {"Error compiling shader type " + std::to_string(type)};
+ }
+
+ glShaderSource(shader, 1, &text, &len);
+ glCompileShader(shader);
+
+ CheckShaderError(shader, GL_COMPILE_STATUS, false, "Error compiling shader!");
+
+ return shader;
+}
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