/**
* maps all or part of the data store of a buffer object into the client's address space. offset
* and length indicate the range of data in the buffer object that is to be mapped, in terms of
* basic machine units. access is a bitfield containing flags which describe the requested
* mapping. These flags are described below.
*
* <p>If no error occurs, a pointer to the beginning of the mapped range is returned once all
* pending operations on that buffer have completed, and may be used to modify and/or query the
* corresponding range of the buffer, according to the following flag bits set in access:
*
* <ul>
* <li>{@linkplain #MAP_READ_BIT}
* <li>{@linkplain #MAP_WRITE_BIT}
* </ul>
*
* Furthermore, the following optional flag bits in access may be used to modify the mapping:
*
* <ul>
* <li>{@linkplain #MAP_INVALIDATE_RANGE_BIT}
* <li>{@linkplain #MAP_INVALIDATE_BUFFER_BIT}
* <li>{@linkplain #MAP_FLUSH_EXPLICIT_BIT}
* <li>{@linkplain #MAP_UNSYNCHRONIZED_BIT}
* </ul>
*
* <p>If an error occurs, glMapBufferRange returns a NULL pointer. If no error occurs, the
* returned pointer will reflect an alignment of at least GL_MIN_MAP_BUFFER_ALIGNMENT basic
* machine units. The value of GL_MIN_MAP_BUFFER_ALIGNMENT can be retrieved by calling glGet with
* pname set to GL_MIN_MAP_BUFFER_ALIGNMENT and must be a power of two that is at least 64.
* Subtracting offset from this returned pointed will always produce a multiple of
* GL_MIN_MAP_BUFFER_ALINMENT.
*/
public ByteBuffer mapRange(int theOffset, int theLength, int theAccess) {
bind();
GL4 gl = GLGraphics.currentGL();
ByteBuffer myResult = gl.glMapBufferRange(_myTarget.glID, theOffset, theLength, theAccess);
// unbind();
return myResult;
}
@Override
protected boolean render(GL gl) {
GL4 gl4 = (GL4) gl;
{
gl4.glBindBuffer(GL_UNIFORM_BUFFER, bufferName.get(Buffer.TRANSFORM));
ByteBuffer pointer =
gl4.glMapBufferRange(
GL_UNIFORM_BUFFER, 0, Mat4.SIZE, GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT);
Mat4 projection =
glm.perspectiveFov_((float) Math.PI * 0.25f, windowSize.x, windowSize.y, 0.1f, 100.0f);
Mat4 model = new Mat4(1.0f);
pointer.asFloatBuffer().put(projection.mul(viewMat4()).mul(model).toFa_());
// Make sure the uniform buffer is uploaded
gl4.glUnmapBuffer(GL_UNIFORM_BUFFER);
}
gl4.glViewportIndexedf(0, 0, 0, windowSize.x, windowSize.y);
gl4.glClearBufferfv(GL_COLOR, 0, new float[] {1.0f, 0.5f, 0.0f, 1.0f}, 0);
gl4.glBindProgramPipeline(pipelineName.get(0));
gl4.glActiveTexture(GL_TEXTURE0);
gl4.glBindTexture(GL_TEXTURE_2D_ARRAY, textureName.get(0));
gl4.glBindVertexArray(vertexArrayName.get(0));
gl4.glBindBufferBase(
GL_UNIFORM_BUFFER, Semantic.Uniform.TRANSFORM0, bufferName.get(Buffer.TRANSFORM));
gl4.glDrawElementsInstancedBaseVertexBaseInstance(
GL_TRIANGLES, elementCount, GL_UNSIGNED_SHORT, 0, 1, 0, 0);
return true;
}
