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+/*
+ * Copyright (c) 2017 Rob Clark <rclark@redhat.com>
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "common.h"
+#include "esUtil.h"
+
+
+struct {
+ struct egl egl;
+
+ GLfloat aspect;
+
+ GLuint program;
+ GLint modelviewmatrix, modelviewprojectionmatrix, normalmatrix;
+ GLuint vbo;
+ GLuint positionsoffset, colorsoffset, normalsoffset;
+} gl;
+
+static const GLfloat vVertices[] = {
+ // front
+ -1.0f, -1.0f, +1.0f,
+ +1.0f, -1.0f, +1.0f,
+ -1.0f, +1.0f, +1.0f,
+ +1.0f, +1.0f, +1.0f,
+ // back
+ +1.0f, -1.0f, -1.0f,
+ -1.0f, -1.0f, -1.0f,
+ +1.0f, +1.0f, -1.0f,
+ -1.0f, +1.0f, -1.0f,
+ // right
+ +1.0f, -1.0f, +1.0f,
+ +1.0f, -1.0f, -1.0f,
+ +1.0f, +1.0f, +1.0f,
+ +1.0f, +1.0f, -1.0f,
+ // left
+ -1.0f, -1.0f, -1.0f,
+ -1.0f, -1.0f, +1.0f,
+ -1.0f, +1.0f, -1.0f,
+ -1.0f, +1.0f, +1.0f,
+ // top
+ -1.0f, +1.0f, +1.0f,
+ +1.0f, +1.0f, +1.0f,
+ -1.0f, +1.0f, -1.0f,
+ +1.0f, +1.0f, -1.0f,
+ // bottom
+ -1.0f, -1.0f, -1.0f,
+ +1.0f, -1.0f, -1.0f,
+ -1.0f, -1.0f, +1.0f,
+ +1.0f, -1.0f, +1.0f,
+};
+
+static const GLfloat vColors[] = {
+ // front
+ 0.0f, 0.0f, 1.0f, // blue
+ 1.0f, 0.0f, 1.0f, // magenta
+ 0.0f, 1.0f, 1.0f, // cyan
+ 1.0f, 1.0f, 1.0f, // white
+ // back
+ 1.0f, 0.0f, 0.0f, // red
+ 0.0f, 0.0f, 0.0f, // black
+ 1.0f, 1.0f, 0.0f, // yellow
+ 0.0f, 1.0f, 0.0f, // green
+ // right
+ 1.0f, 0.0f, 1.0f, // magenta
+ 1.0f, 0.0f, 0.0f, // red
+ 1.0f, 1.0f, 1.0f, // white
+ 1.0f, 1.0f, 0.0f, // yellow
+ // left
+ 0.0f, 0.0f, 0.0f, // black
+ 0.0f, 0.0f, 1.0f, // blue
+ 0.0f, 1.0f, 0.0f, // green
+ 0.0f, 1.0f, 1.0f, // cyan
+ // top
+ 0.0f, 1.0f, 1.0f, // cyan
+ 1.0f, 1.0f, 1.0f, // white
+ 0.0f, 1.0f, 0.0f, // green
+ 1.0f, 1.0f, 0.0f, // yellow
+ // bottom
+ 0.0f, 0.0f, 0.0f, // black
+ 1.0f, 0.0f, 0.0f, // red
+ 0.0f, 0.0f, 1.0f, // blue
+ 1.0f, 0.0f, 1.0f // magenta
+};
+
+static const GLfloat vNormals[] = {
+ // front
+ +0.0f, +0.0f, +1.0f, // forward
+ +0.0f, +0.0f, +1.0f, // forward
+ +0.0f, +0.0f, +1.0f, // forward
+ +0.0f, +0.0f, +1.0f, // forward
+ // back
+ +0.0f, +0.0f, -1.0f, // backward
+ +0.0f, +0.0f, -1.0f, // backward
+ +0.0f, +0.0f, -1.0f, // backward
+ +0.0f, +0.0f, -1.0f, // backward
+ // right
+ +1.0f, +0.0f, +0.0f, // right
+ +1.0f, +0.0f, +0.0f, // right
+ +1.0f, +0.0f, +0.0f, // right
+ +1.0f, +0.0f, +0.0f, // right
+ // left
+ -1.0f, +0.0f, +0.0f, // left
+ -1.0f, +0.0f, +0.0f, // left
+ -1.0f, +0.0f, +0.0f, // left
+ -1.0f, +0.0f, +0.0f, // left
+ // top
+ +0.0f, +1.0f, +0.0f, // up
+ +0.0f, +1.0f, +0.0f, // up
+ +0.0f, +1.0f, +0.0f, // up
+ +0.0f, +1.0f, +0.0f, // up
+ // bottom
+ +0.0f, -1.0f, +0.0f, // down
+ +0.0f, -1.0f, +0.0f, // down
+ +0.0f, -1.0f, +0.0f, // down
+ +0.0f, -1.0f, +0.0f // down
+};
+
+static const char *vertex_shader_source =
+ "uniform mat4 modelviewMatrix; \n"
+ "uniform mat4 modelviewprojectionMatrix;\n"
+ "uniform mat3 normalMatrix; \n"
+ " \n"
+ "attribute vec4 in_position; \n"
+ "attribute vec3 in_normal; \n"
+ "attribute vec4 in_color; \n"
+ "\n"
+ "vec4 lightSource = vec4(2.0, 2.0, 20.0, 0.0);\n"
+ " \n"
+ "varying vec4 vVaryingColor; \n"
+ " \n"
+ "void main() \n"
+ "{ \n"
+ " gl_Position = modelviewprojectionMatrix * in_position;\n"
+ " vec3 vEyeNormal = normalMatrix * in_normal;\n"
+ " vec4 vPosition4 = modelviewMatrix * in_position;\n"
+ " vec3 vPosition3 = vPosition4.xyz / vPosition4.w;\n"
+ " vec3 vLightDir = normalize(lightSource.xyz - vPosition3);\n"
+ " float diff = max(0.0, dot(vEyeNormal, vLightDir));\n"
+ " vVaryingColor = vec4(diff * in_color.rgb, 1.0);\n"
+ "} \n";
+
+static const char *fragment_shader_source =
+ "precision mediump float; \n"
+ " \n"
+ "varying vec4 vVaryingColor; \n"
+ " \n"
+ "void main() \n"
+ "{ \n"
+ " gl_FragColor = vVaryingColor; \n"
+ "} \n";
+
+
+static void draw_cube_smooth(unsigned i)
+{
+ ESMatrix modelview;
+
+ /* clear the color buffer */
+ glClearColor(0.5, 0.5, 0.5, 1.0);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ esMatrixLoadIdentity(&modelview);
+ esTranslate(&modelview, 0.0f, 0.0f, -8.0f);
+ esRotate(&modelview, 45.0f + (0.25f * i), 1.0f, 0.0f, 0.0f);
+ esRotate(&modelview, 45.0f - (0.5f * i), 0.0f, 1.0f, 0.0f);
+ esRotate(&modelview, 10.0f + (0.15f * i), 0.0f, 0.0f, 1.0f);
+
+ ESMatrix projection;
+ esMatrixLoadIdentity(&projection);
+ esFrustum(&projection, -2.8f, +2.8f, -2.8f * gl.aspect, +2.8f * gl.aspect, 6.0f, 10.0f);
+
+ ESMatrix modelviewprojection;
+ esMatrixLoadIdentity(&modelviewprojection);
+ esMatrixMultiply(&modelviewprojection, &modelview, &projection);
+
+ float normal[9];
+ normal[0] = modelview.m[0][0];
+ normal[1] = modelview.m[0][1];
+ normal[2] = modelview.m[0][2];
+ normal[3] = modelview.m[1][0];
+ normal[4] = modelview.m[1][1];
+ normal[5] = modelview.m[1][2];
+ normal[6] = modelview.m[2][0];
+ normal[7] = modelview.m[2][1];
+ normal[8] = modelview.m[2][2];
+
+ glUniformMatrix4fv(gl.modelviewmatrix, 1, GL_FALSE, &modelview.m[0][0]);
+ glUniformMatrix4fv(gl.modelviewprojectionmatrix, 1, GL_FALSE, &modelviewprojection.m[0][0]);
+ glUniformMatrix3fv(gl.normalmatrix, 1, GL_FALSE, normal);
+
+ glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+ glDrawArrays(GL_TRIANGLE_STRIP, 4, 4);
+ glDrawArrays(GL_TRIANGLE_STRIP, 8, 4);
+ glDrawArrays(GL_TRIANGLE_STRIP, 12, 4);
+ glDrawArrays(GL_TRIANGLE_STRIP, 16, 4);
+ glDrawArrays(GL_TRIANGLE_STRIP, 20, 4);
+}
+
+const struct egl * init_cube_smooth(const struct gbm *gbm)
+{
+ int ret;
+
+ ret = init_egl(&gl.egl, gbm);
+ if (ret)
+ return NULL;
+
+ gl.aspect = (GLfloat)(gbm->height) / (GLfloat)(gbm->width);
+
+ ret = create_program(vertex_shader_source, fragment_shader_source);
+ if (ret < 0)
+ return NULL;
+
+ gl.program = ret;
+
+ glBindAttribLocation(gl.program, 0, "in_position");
+ glBindAttribLocation(gl.program, 1, "in_normal");
+ glBindAttribLocation(gl.program, 2, "in_color");
+
+ ret = link_program(gl.program);
+ if (ret)
+ return NULL;
+
+ glUseProgram(gl.program);
+
+ gl.modelviewmatrix = glGetUniformLocation(gl.program, "modelviewMatrix");
+ gl.modelviewprojectionmatrix = glGetUniformLocation(gl.program, "modelviewprojectionMatrix");
+ gl.normalmatrix = glGetUniformLocation(gl.program, "normalMatrix");
+
+ glViewport(0, 0, gbm->width, gbm->height);
+ glEnable(GL_CULL_FACE);
+
+ gl.positionsoffset = 0;
+ gl.colorsoffset = sizeof(vVertices);
+ gl.normalsoffset = sizeof(vVertices) + sizeof(vColors);
+ glGenBuffers(1, &gl.vbo);
+ glBindBuffer(GL_ARRAY_BUFFER, gl.vbo);
+ glBufferData(GL_ARRAY_BUFFER, sizeof(vVertices) + sizeof(vColors) + sizeof(vNormals), 0, GL_STATIC_DRAW);
+ glBufferSubData(GL_ARRAY_BUFFER, gl.positionsoffset, sizeof(vVertices), &vVertices[0]);
+ glBufferSubData(GL_ARRAY_BUFFER, gl.colorsoffset, sizeof(vColors), &vColors[0]);
+ glBufferSubData(GL_ARRAY_BUFFER, gl.normalsoffset, sizeof(vNormals), &vNormals[0]);
+ glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid *)(intptr_t)gl.positionsoffset);
+ glEnableVertexAttribArray(0);
+ glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid *)(intptr_t)gl.normalsoffset);
+ glEnableVertexAttribArray(1);
+ glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid *)(intptr_t)gl.colorsoffset);
+ glEnableVertexAttribArray(2);
+
+ gl.egl.draw = draw_cube_smooth;
+
+ return &gl.egl;
+}
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