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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "backends/graphics/opengl/shader.h"
#if !USE_FORCED_GL && !USE_FORCED_GLES
#include "common/textconsole.h"
namespace OpenGL {
const char *const g_defaultVertexShader =
"attribute vec4 position;\n"
"attribute vec2 texCoordIn;\n"
"attribute vec4 blendColorIn;\n"
"\n"
"uniform mat4 projection;\n"
"\n"
"varying vec2 texCoord;\n"
"varying vec4 blendColor;\n"
"\n"
"void main(void) {\n"
"\ttexCoord = texCoordIn;\n"
"\tblendColor = blendColorIn;\n"
"\tgl_Position = projection * position;\n"
"}\n";
const char *const g_defaultFragmentShader =
"varying lowp vec2 texCoord;\n"
"varying lowp vec4 blendColor;\n"
"\n"
"uniform sampler2D texture;\n"
"\n"
"void main(void) {\n"
"\tgl_FragColor = blendColor * texture2D(texture, texCoord);\n"
"}\n";
Shader::Shader(const Common::String &vertex, const Common::String &fragment)
: _vertex(vertex), _fragment(fragment), _program(0), _projectionLocation(-1), _textureLocation(-1) {
}
void Shader::destroy() {
GL_CALL(glDeleteProgram(_program));
_program = 0;
}
bool Shader::recreate() {
// Make sure any old programs are destroyed properly.
destroy();
GLuint vertexShader = compileShader(_vertex.c_str(), GL_VERTEX_SHADER);
if (!vertexShader) {
return false;
}
GLuint fragmentShader = compileShader(_fragment.c_str(), GL_FRAGMENT_SHADER);
if (!fragmentShader) {
GL_CALL(glDeleteShader(vertexShader));
return false;
}
GL_ASSIGN(_program, glCreateProgram());
if (!_program) {
GL_CALL(glDeleteShader(vertexShader));
GL_CALL(glDeleteShader(fragmentShader));
return false;
}
GL_CALL(glAttachShader(_program, vertexShader));
GL_CALL(glAttachShader(_program, fragmentShader));
GL_CALL(glBindAttribLocation(_program, kPositionAttribLocation, "position"));
GL_CALL(glBindAttribLocation(_program, kTexCoordAttribLocation, "texCoordIn"));
GL_CALL(glBindAttribLocation(_program, kColorAttribLocation, "blendColorIn"));
GL_CALL(glLinkProgram(_program));
GL_CALL(glDetachShader(_program, fragmentShader));
GL_CALL(glDeleteShader(fragmentShader));
GL_CALL(glDetachShader(_program, vertexShader));
GL_CALL(glDeleteShader(vertexShader));
GLint result;
GL_CALL(glGetProgramiv(_program, GL_LINK_STATUS, &result));
if (result == GL_FALSE) {
GLint logSize;
GL_CALL(glGetProgramiv(_program, GL_INFO_LOG_LENGTH, &logSize));
GLchar *log = new GLchar[logSize];
GL_CALL(glGetProgramInfoLog(_program, logSize, nullptr, log));
warning("Could not link shader: \"%s\"", log);
delete[] log;
destroy();
return false;
}
GL_ASSIGN(_projectionLocation, glGetUniformLocation(_program, "projection"));
if (_projectionLocation == -1) {
warning("Shader misses \"projection\" uniform.");
destroy();
return false;
}
GL_ASSIGN(_textureLocation, glGetUniformLocation(_program, "texture"));
if (_textureLocation == -1) {
warning("Shader misses \"texture\" uniform.");
destroy();
return false;
}
return true;
}
void Shader::activate(const GLfloat *projectionMatrix) {
// Activate program.
GL_CALL(glUseProgram(_program));
// Set projection matrix.
GL_CALL(glUniformMatrix4fv(_projectionLocation, 1, GL_FALSE, projectionMatrix));
// We always use texture unit 0.
GL_CALL(glUniform1i(_textureLocation, 0));
}
GLuint Shader::compileShader(const char *source, GLenum shaderType) {
GLuint handle;
GL_ASSIGN(handle, glCreateShader(shaderType));
if (!handle) {
return 0;
}
GL_CALL(glShaderSource(handle, 1, &source, nullptr));
GL_CALL(glCompileShader(handle));
GLint result;
GL_CALL(glGetShaderiv(handle, GL_COMPILE_STATUS, &result));
if (result == GL_FALSE) {
GLint logSize;
GL_CALL(glGetShaderiv(handle, GL_INFO_LOG_LENGTH, &logSize));
GLchar *log = new GLchar[logSize];
GL_CALL(glGetShaderInfoLog(handle, logSize, nullptr, log));
warning("Could not compile shader \"%s\": \"%s\"", source, log);
delete[] log;
GL_CALL(glDeleteShader(handle));
return 0;
}
return handle;
}
} // End of namespace OpenGL
#endif // !USE_FORCED_GL && !USE_FORCED_GLES
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