protected boolean prepare(int fbufWidth, int fbufHeight) {
if (ctx.useShader(this) && glIsProgram(program)) {
glUseProgram(program);
ctx.checkGLError("Shader.prepare useProgram");
glUniform2f(uScreenSizeLoc, fbufWidth, fbufHeight);
// ctx.checkGLError("Shader.prepare uScreenSizeLoc set to " + fbufWidth + " " + fbufHeight);
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementBuffer);
ctx.checkGLError("Shader.prepare BindBuffer");
glEnableVertexAttribArray(aMatrix);
glEnableVertexAttribArray(aTranslation);
glEnableVertexAttribArray(aPosition);
if (aTexture != -1) glEnableVertexAttribArray(aTexture);
ctx.checkGLError("Shader.prepare AttribArrays enabled");
glVertexAttribPointer(aMatrix, 4, GL_FLOAT, false, VERTEX_STRIDE, 0);
glVertexAttribPointer(aTranslation, 2, GL_FLOAT, false, VERTEX_STRIDE, 16);
glVertexAttribPointer(aPosition, 2, GL_FLOAT, false, VERTEX_STRIDE, 24);
if (aTexture != -1) glVertexAttribPointer(aTexture, 2, GL_FLOAT, false, VERTEX_STRIDE, 32);
ctx.checkGLError("Shader.prepare AttribPointer");
return true;
}
return false;
}
