/*
 * Copyright (c) 2012-2013 Etnaviv Project
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sub license,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
/* Experiments with alpha blending
 */
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdbool.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <stdarg.h>
#include <assert.h>
#include <math.h>

#include <errno.h>

#include "etna_pipe.h"
#include "util/u_inlines.h"
#include "write_bmp.h"
#include "state_tracker/graw.h"
#include "fbdemos.h"

#include "esTransform.h"
#include "dds.h"

/*********************************************************************/
#define VERTEX_BUFFER_SIZE 0x60000

float vVertices[] = {
  -1.0f, -1.0f, +0.0f,
  +1.0f, -1.0f, +0.0f,
  -1.0f, +1.0f, +0.0f,
  +1.0f, +1.0f, +0.0f,
};

float vColors[] = {
  0.8f,  0.8f,  0.8f,
  0.9f,  0.9f,  0.9f,
  1.0f,  1.0f,  1.0f,
  1.0f,  1.0f,  1.0f,
};

float vNormals[] = {
  +0.0f, +0.0f, +1.0f,
  +0.0f, +0.0f, +1.0f,
  +0.0f, +0.0f, +1.0f,
  +0.0f, +0.0f, +1.0f,
};

#define COMPONENTS_PER_VERTEX (3)
#define NUM_VERTICES (4)

static const char alpha_blend_vert[] = 
"VERT\n"
"DCL IN[0]\n"
"DCL IN[1]\n"
"DCL IN[2]\n"
"DCL OUT[0], POSITION\n"
"DCL OUT[1], GENERIC[0]\n"
"DCL CONST[0..4]\n"
"DCL TEMP[0], LOCAL\n"
"  0: MUL TEMP[0], CONST[0], IN[0].xxxx\n"
"  1: MAD TEMP[0], CONST[1], IN[0].yyyy, TEMP[0]\n"
"  2: MAD TEMP[0], CONST[2], IN[0].zzzz, TEMP[0]\n"
"  3: MAD TEMP[0], CONST[3], IN[0].wwww, TEMP[0]\n"
"  4: MUL OUT[1], IN[2], CONST[4]\n"
"  6: MOV OUT[0], TEMP[0]\n"
"  7: END\n";

/* simple passthrough */
static const char alpha_blend_frag[] = 
"FRAG\n"
"PROPERTY FS_COLOR0_WRITES_ALL_CBUFS 1\n"
"DCL IN[0], GENERIC[0], PERSPECTIVE\n"
"DCL OUT[0], COLOR\n"
"  0: MOV OUT[0], IN[0]\n"
"  1: END\n";

int main(int argc, char **argv)
{
    struct fbdemos_scaffold *fbs = 0;
    fbdemo_init(&fbs);
    int width = fbs->width;
    int height = fbs->height;
    struct pipe_context *pipe = fbs->pipe;

    /* resources */
    struct pipe_resource *rt_resource = fbdemo_create_2d(fbs->screen, PIPE_BIND_RENDER_TARGET, PIPE_FORMAT_B8G8R8X8_UNORM, width, height, 0);
    struct pipe_resource *z_resource = fbdemo_create_2d(fbs->screen, PIPE_BIND_RENDER_TARGET, PIPE_FORMAT_Z16_UNORM, width, height, 0);
    struct pipe_resource *vtx_resource = pipe_buffer_create(fbs->screen, PIPE_BIND_VERTEX_BUFFER, PIPE_USAGE_IMMUTABLE, VERTEX_BUFFER_SIZE);

    /* bind render target to framebuffer */
    etna_fb_bind_resource(fbs, rt_resource);

    /* interleave vertex data */
    struct pipe_transfer *transfer = 0;
    float *vtx_logical = pipe_buffer_map(pipe, vtx_resource, PIPE_TRANSFER_WRITE | PIPE_TRANSFER_UNSYNCHRONIZED, &transfer);
    assert(vtx_logical);
    for(int vert=0; vert<NUM_VERTICES; ++vert)
    {
        int dest_idx = vert * (3 + 3 + 3);
        for(int comp=0; comp<3; ++comp)
            vtx_logical[dest_idx+comp+0] = vVertices[vert*3 + comp]; /* 0 */
        for(int comp=0; comp<3; ++comp)
            vtx_logical[dest_idx+comp+3] = vNormals[vert*3 + comp]; /* 1 */
        for(int comp=0; comp<3; ++comp)
            vtx_logical[dest_idx+comp+6] = vColors[vert*3 + comp]; /* 2 */
    }
    pipe_buffer_unmap(pipe, transfer);

    /* compile gallium3d states */
    void *blend = pipe->create_blend_state(pipe, &(struct pipe_blend_state) {
                .rt[0] = {
                    .blend_enable = 1,
                    .rgb_func = PIPE_BLEND_ADD,
                    .rgb_src_factor = PIPE_BLENDFACTOR_SRC_ALPHA,
                    .rgb_dst_factor = PIPE_BLENDFACTOR_INV_SRC_ALPHA,
                    .alpha_func = PIPE_BLEND_ADD,
                    .alpha_src_factor = PIPE_BLENDFACTOR_SRC_ALPHA,
                    .alpha_dst_factor = PIPE_BLENDFACTOR_INV_SRC_ALPHA,
                    .colormask = 0xf
                }
            });

    void *sampler = pipe->create_sampler_state(pipe, &(struct pipe_sampler_state) {
                .wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE,
                .wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE,
                .wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE,
                .min_img_filter = PIPE_TEX_FILTER_LINEAR,
                .min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR,
                .mag_img_filter = PIPE_TEX_FILTER_LINEAR,
                .normalized_coords = 1,
                .lod_bias = 0.0f,
                .min_lod = 0.0f, .max_lod=1000.0f
            });

    void *rasterizer = pipe->create_rasterizer_state(pipe, &(struct pipe_rasterizer_state){
                .flatshade = 0,
                .light_twoside = 1,
                .clamp_vertex_color = 1,
                .clamp_fragment_color = 1,
                .front_ccw = 0,
                .cull_face = PIPE_FACE_BACK,      /**< PIPE_FACE_x */
                .fill_front = PIPE_POLYGON_MODE_FILL,     /**< PIPE_POLYGON_MODE_x */
                .fill_back = PIPE_POLYGON_MODE_FILL,      /**< PIPE_POLYGON_MODE_x */
                .offset_point = 0,
                .offset_line = 0,
                .offset_tri = 0,
                .scissor = 0,
                .poly_smooth = 1,
                .poly_stipple_enable = 0,
                .point_smooth = 0,
                .sprite_coord_mode = 0,     /**< PIPE_SPRITE_COORD_ */
                .point_quad_rasterization = 0, /** points rasterized as quads or points */
                .point_size_per_vertex = 0, /**< size computed in vertex shader */
                .multisample = 0,
                .line_smooth = 0,
                .line_stipple_enable = 0,
                .line_last_pixel = 0,
                .flatshade_first = 0,
                .half_pixel_center = 1,
                .rasterizer_discard = 0,
                .depth_clip = 0,
                .clip_plane_enable = 0,
                .line_stipple_factor = 0,
                .line_stipple_pattern = 0,
                .sprite_coord_enable = 0,
                .line_width = 1.0f,
                .point_size = 1.0f,
                .offset_units = 0.0f,
                .offset_scale = 0.0f,
                .offset_clamp = 0.0f
            });

    void *dsa = pipe->create_depth_stencil_alpha_state(pipe, &(struct pipe_depth_stencil_alpha_state){
            .depth = {
                .enabled = 0,
                .writemask = 0,
                .func = PIPE_FUNC_LESS /* GL default */
            },
            .stencil[0] = {
                .enabled = 0
            },
            .stencil[1] = {
                .enabled = 0
            },
            .alpha = {
                .enabled = 0
            }
            });

    struct pipe_vertex_buffer vertex_buf_desc = {
            .stride = (3 + 3 + 3)*4,
            .buffer_offset = 0,
            .buffer = vtx_resource,
            .user_buffer = 0
            };
    
    struct pipe_vertex_element pipe_vertex_elements[] = {
        { /* positions */
            .src_offset = 0,
            .instance_divisor = 0,
            .vertex_buffer_index = 0,
            .src_format = PIPE_FORMAT_R32G32B32_FLOAT 
        },
        { /* normals */
            .src_offset = 0xc,
            .instance_divisor = 0,
            .vertex_buffer_index = 0,
            .src_format = PIPE_FORMAT_R32G32B32_FLOAT 
        },
        { /* texture coord */
            .src_offset = 0x18,
            .instance_divisor = 0,
            .vertex_buffer_index = 0,
            .src_format = PIPE_FORMAT_R32G32B32_FLOAT
        }
    };
    void *vertex_elements = pipe->create_vertex_elements_state(pipe, 
            sizeof(pipe_vertex_elements)/sizeof(pipe_vertex_elements[0]), pipe_vertex_elements);
    struct pipe_surface *cbuf = pipe->create_surface(pipe, rt_resource, &(struct pipe_surface){
        .texture = rt_resource,
        .format = rt_resource->format,
        .u.tex.level = 0
        });
    struct pipe_surface *zsbuf = pipe->create_surface(pipe, z_resource, &(struct pipe_surface){
        .texture = z_resource,
        .format = z_resource->format,
        .u.tex.level = 0
        });
    
    /* bind */
    pipe->bind_blend_state(pipe, blend);
    pipe->bind_fragment_sampler_states(pipe, 1, &sampler);
    pipe->bind_rasterizer_state(pipe, rasterizer);
    pipe->bind_depth_stencil_alpha_state(pipe, dsa);
    pipe->bind_vertex_elements_state(pipe, vertex_elements);

    pipe->set_blend_color(pipe, &(struct pipe_blend_color){
            .color = {0.0f,0.0f,0.0f,1.0f}
            });
    pipe->set_stencil_ref(pipe, &(struct pipe_stencil_ref){
            .ref_value[0] = 0xff,
            .ref_value[1] = 0xff
            });
    pipe->set_sample_mask(pipe, 0xf);
    pipe->set_framebuffer_state(pipe, &(struct pipe_framebuffer_state){
            .width = width,
            .height = height,
            .nr_cbufs = 1,
            .cbufs[0] = cbuf,
            .zsbuf = zsbuf
            });
    pipe->set_scissor_states(pipe, 0, 1, &(struct pipe_scissor_state){
            .minx = 0,
            .miny = 0,
            .maxx = 65535,
            .maxy = 65535
            });
    pipe->set_viewport_states(pipe, 0, 1, &(struct pipe_viewport_state){
            .scale = {width/2.0f, height/2.0f, 0.5f, 1.0f},
            .translate = {width/2.0f, height/2.0f, 0.5f, 1.0f}
            });

    pipe->set_vertex_buffers(pipe, 0, 1, &vertex_buf_desc);
    pipe->set_index_buffer(pipe, NULL);/*&(struct pipe_index_buffer){
            .index_size = 0,
            .offset = 0,
            .buffer = 0,
            .user_buffer = 0
            });*/ /* non-indexed rendering */
    
    void *vtx_shader = graw_parse_vertex_shader(pipe, alpha_blend_vert);
    void *frag_shader = graw_parse_fragment_shader(pipe, alpha_blend_frag);
    pipe->bind_vs_state(pipe, vtx_shader);
    pipe->bind_fs_state(pipe, frag_shader);

    for(int frame=0; frame<1000; ++frame)
    {
        if(frame%50 == 0)
            printf("*** FRAME %i ****\n", frame);

        /*   Compute transform matrices in the same way as cube egl demo */ 
        ESMatrix projection;
        float aspect = (float)(height) / (float)(width);
        esMatrixLoadIdentity(&projection);
        esFrustum(&projection, -1.8f, +1.8f, -1.8f * aspect, +1.8f * aspect, 5.0f, 10.0f);

        /* Clear render target */
        pipe->clear(pipe, PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL, &(const union pipe_color_union) {
                .f = {0.2, 0.2, 0.2, 1.0}
                }, 1.0, 0xff);

        for(int idx=0; idx<5; ++idx)
        {
            float vs_const[5*4];
            ESMatrix modelview, modelviewprojection;
            esMatrixLoadIdentity(&modelview);

            esTranslate(&modelview, 0.0f, 0.0f, -7.0f);
            //esRotate(&modelview, 25.0f, 1.0f, 0.0f, 0.0f);
            esRotate(&modelview, 35.0f, 0.0f, 1.0f, 0.0f);
            esRotate(&modelview, frame*0.15f, 1.0f, 0.0f, 0.0f);
            esTranslate(&modelview, 0.0f, 0.0f, 0.3f * idx);

            esMatrixLoadIdentity(&modelviewprojection);
            esMatrixMultiply(&modelviewprojection, &modelview, &projection);
        
            memcpy(&vs_const[0], (uint32_t*)&modelviewprojection.m[0][0], 16 * 4);
            /* material color */
            vs_const[16] = idx*0.25f;
            vs_const[17] = 0.3f;
            vs_const[18] = 1.0f - idx*0.25f;
            vs_const[19] = 0.5f;
            pipe->set_constant_buffer(pipe, PIPE_SHADER_VERTEX, 0, &(struct pipe_constant_buffer){
                    .user_buffer = vs_const,
                    .buffer_size = sizeof(vs_const)
                    });
        
            pipe->draw_vbo(pipe, &(struct pipe_draw_info){
                    .indexed = 0,
                    .mode = PIPE_PRIM_TRIANGLE_STRIP,
                    .start = 0,
                    .count = 4
                    });
        }
        
#if 0
        etna_dump_cmd_buffer(ctx);
        exit(0);
#endif    
        etna_swap_buffers(fbs->buffers);
    }
#ifdef DUMP
    bmp_dump32(etna_bo_map(fbs->fb.buffer[1-fbs->buffers->backbuffer]), width, height, false, "/mnt/sdcard/fb.bmp");
    printf("Dump complete\n");
#endif
    fbdemo_free(fbs);
    return 0;
}