115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
#include <math.h>
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#include <orca.h>
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oc_vec2 frameSize = { 100, 100 };
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oc_surface surface;
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unsigned int program;
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const char* vshaderSource =
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"attribute vec4 vPosition;\n"
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"uniform mat4 transform;\n"
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"void main()\n"
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"{\n"
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" gl_Position = transform*vPosition;\n"
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"}\n";
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const char* fshaderSource =
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"precision mediump float;\n"
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"void main()\n"
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"{\n"
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" gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);\n"
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"}\n";
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void compile_shader(GLuint shader, const char* source)
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{
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glShaderSource(shader, 1, &source, 0);
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glCompileShader(shader);
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int err = glGetError();
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if(err)
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{
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oc_log_info("gl error");
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}
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}
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ORCA_EXPORT void oc_on_init(void)
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{
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oc_window_set_title(OC_STR8("triangle"));
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surface = oc_surface_gles();
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oc_surface_select(surface);
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const char* extensions = (const char*)glGetString(GL_EXTENSIONS);
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oc_log_info("GLES extensions: %s\n", extensions);
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int extensionCount = 0;
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glGetIntegerv(GL_NUM_EXTENSIONS, &extensionCount);
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for(int i = 0; i < extensionCount; i++)
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{
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const char* extension = (const char*)glGetStringi(GL_EXTENSIONS, i);
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oc_log_info("GLES extension %i: %s\n", i, extension);
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}
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unsigned int vshader = glCreateShader(GL_VERTEX_SHADER);
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unsigned int fshader = glCreateShader(GL_FRAGMENT_SHADER);
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program = glCreateProgram();
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compile_shader(vshader, vshaderSource);
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compile_shader(fshader, fshaderSource);
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glAttachShader(program, vshader);
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glAttachShader(program, fshader);
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glLinkProgram(program);
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glUseProgram(program);
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GLfloat vertices[] = {
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-0.866 / 2, -0.5 / 2, 0, 0.866 / 2, -0.5 / 2, 0, 0, 0.5, 0
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};
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GLuint buffer;
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glGenBuffers(1, &buffer);
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glBindBuffer(GL_ARRAY_BUFFER, buffer);
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glBufferData(GL_ARRAY_BUFFER, 9 * sizeof(GLfloat), vertices, GL_STATIC_DRAW);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
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glEnableVertexAttribArray(0);
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}
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ORCA_EXPORT void oc_on_resize(u32 width, u32 height)
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{
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oc_log_info("frame resize %u, %u", width, height);
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frameSize.x = width;
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frameSize.y = height;
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}
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ORCA_EXPORT void oc_on_frame_refresh(void)
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{
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f32 aspect = frameSize.x / frameSize.y;
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oc_surface_select(surface);
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glClearColor(0, 1, 1, 1);
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glClear(GL_COLOR_BUFFER_BIT);
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static float alpha = 0;
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oc_vec2 scaling = oc_surface_contents_scaling(surface);
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glViewport(0, 0, frameSize.x * scaling.x, frameSize.y * scaling.y);
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GLfloat matrix[] = { cosf(alpha) / aspect, sinf(alpha), 0, 0,
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-sinf(alpha) / aspect, cosf(alpha), 0, 0,
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0, 0, 1, 0,
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0, 0, 0, 1 };
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alpha += 2 * M_PI / 120;
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glUniformMatrix4fv(0, 1, false, matrix);
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glDrawArrays(GL_TRIANGLES, 0, 3);
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oc_surface_present(surface);
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}
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