#include <llmr/renderer/painter.hpp>

using namespace llmr;

void Painter::preparePrerender(const GenericProperties &properties) {
    glDisable(GL_DEPTH_TEST);
    glDisable(GL_STENCIL_TEST);

// Render the actual tile.
#if GL_EXT_discard_framebuffer
    const GLenum discards[] = {GL_COLOR_ATTACHMENT0};
    glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, discards);
#endif
    glClear(GL_COLOR_BUFFER_BIT);

    glViewport(0, 0, properties.prerenderSize, properties.prerenderSize);
}

void Painter::finishPrerender(const GenericProperties &properties) {
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_STENCIL_TEST);

    glViewport(0, 0, gl_viewport[0], gl_viewport[1]);
}

void Painter::renderPrerenderedTexture(Bucket &bucket, const GenericProperties &properties) {
    const int buffer = 4096 * properties.prerenderBuffer;

    // draw the texture on a quad
    depthMask(false);

    useProgram(rasterShader->program);
    rasterShader->setMatrix(matrix);
    rasterShader->setOpacity(1);

    glDepthRange(strata, 1.0f);

    glActiveTexture(GL_TEXTURE0);
    rasterShader->setImage(0);
    rasterShader->setBuffer(buffer);
    rasterShader->setOpacity(properties.opacity);
    bucket.prerendered->bindTexture();
    coveringRasterArray.bind(*rasterShader, tileStencilBuffer, BUFFER_OFFSET(0));
    glDrawArrays(GL_TRIANGLES, 0, (GLsizei)tileStencilBuffer.index());

    depthMask(true);
}